From my blog: Bower and Grunt configuration to my theme.

.bowerrc

{
	"directory": "vendor"
}

bootstrap.less

/* -- BEGIN LICENSE BLOCK ---------------------------------------
# This file is part of Boldy, a theme for Dotclear
#
# Theme by Site5 (http://www.s5themes.com)
# under a GPLv2 http://www.gnu.org/licenses/gpl-2.0.txt
# Ported on Dotclear by Guillaume Kulakowski (http://www.llaumgui.com)
#
# -- END LICENSE BLOCK ----------------------------------------- */

// Core variables and mixins
@import "../vendor/bootstrap/less/variables.less";
@import "../vendor/bootstrap/less/mixins.less";

// My variables
@import "variables.less";
@import "mixins.less";

// Reset
@import "../vendor/bootstrap/less/normalize.less";
@import "../vendor/bootstrap/less/print.less";

// Core CSS
@import "../vendor/bootstrap/less/scaffolding.less";
@import "../vendor/bootstrap/less/type.less";
@import "../vendor/bootstrap/less/code.less";
@import "../vendor/bootstrap/less/grid.less";
//@import "../vendor/bootstrap/less/tables.less";
@import "../vendor/bootstrap/less/forms.less";
@import "../vendor/bootstrap/less/buttons.less";

// Components
@import "../vendor/bootstrap/less/component-animations.less";
//@import "../vendor/bootstrap/less/glyphicons.less";
@import "../vendor/bootstrap/less/dropdowns.less";
//@import "../vendor/bootstrap/less/button-groups.less";
//@import "../vendor/bootstrap/less/input-groups.less";
@import "../vendor/bootstrap/less/navs.less";
@import "../vendor/bootstrap/less/navbar.less";
//@import "../vendor/bootstrap/less/breadcrumbs.less";
@import "../vendor/bootstrap/less/pagination.less";
@import "../vendor/bootstrap/less/pager.less";
//@import "../vendor/bootstrap/less/labels.less";
//@import "../vendor/bootstrap/less/badges.less";
//@import "../vendor/bootstrap/less/jumbotron.less";
@import "../vendor/bootstrap/less/thumbnails.less";
@import "../vendor/bootstrap/less/alerts.less";
//@import "../vendor/bootstrap/less/progress-bars.less";
//@import "../vendor/bootstrap/less/media.less";
@import "../vendor/bootstrap/less/list-group.less";
@import "../vendor/bootstrap/less/panels.less";
@import "../vendor/bootstrap/less/wells.less";
//@import "../vendor/bootstrap/less/close.less";

// Components w/ JavaScript
//@import "../vendor/bootstrap/less/modals.less";
@import "../vendor/bootstrap/less/tooltip.less";
//@import "../vendor/bootstrap/less/popovers.less";
@import "../vendor/bootstrap/less/carousel.less";

// Utility classes
@import "../vendor/bootstrap/less/utilities.less";
@import "../vendor/bootstrap/less/responsive-utilities.less";

bower.json

{
  "name": "Boldy",
  "version": "1.1.5",
  "main": [
    "css/screen.css",
    "css/indefero.css",
    "js/global.js"
  ],
  "ignore": [
    ".jshintrc",
    "build.xml",
    "DoxyFile",
    "screenshot.jpg"
  ],
  "private": true,
  "dependencies": {
    "jquery": "~1.*",
    "bootstrap": "3.*",
    "jquery-colorbox": "latest",
    "jquery-cookie": "latest",
    "scroll-to-top": "latest",
    "async-gravatars": "josephscott/async-gravatars",
    "nwxforms": "dperini/nwxforms",
    "headjs": "latest",
    "respond": "latest"
  }
}

Gruntfile.coffee

module.exports = (grunt) ->

  #
  # Settings
  # ========

  # Force use of Unix newlines
  grunt.util.linefeed = '\n'



  #
  # Project configuration
  # =====================
  grunt.initConfig

    pkg: grunt.file.readJSON 'package.json'
    bowerrc: grunt.file.readJSON '.bowerrc'
    csslintrc : grunt.file.readJSON '.csslintrc'


    # Path configuration from .bowerrc
    # --------------------------------
    dirs:
      'vendor': '<%= bowerrc.directory %>'
      'bootstrap':
        'js': '<%= dirs.vendor %>/bootstrap/js'
        'less': '<%= dirs.vendor %>/bootstrap/less'
      'css': 'css'
      'less': 'less'
      'js': 'js'


    # Sources configuration
    # ---------------------
    src: 
      output: 
        'bootstrap':
          'js': '<%= dirs.vendor %>/bootstrap/my/js/bootstrap.js'
          'css': '<%= dirs.vendor %>/bootstrap/my/css/bootstrap.css'
        'boldy':
          css:
            'screen': '<%= dirs.css %>/screen.css'
            'indefero': '<%= dirs.css %>/indefero.css'
          js: '<%= dirs.js %>/global.js'

      input:
        bootstrap:
          'js': [
            '<%= dirs.bootstrap.js %>/dropdown.js'
            '<%= dirs.bootstrap.js %>/tooltip.js'
            '<%= dirs.bootstrap.js %>/collapse.js'
            '<%= dirs.bootstrap.js %>/transition.js'
            '<%= dirs.bootstrap.js %>/carousel.js'
          ],
          'less': [
            '<%= dirs.less %>/bootstrap.less'
          ]
        indefero: '<%= dirs.css %>/indefero.src.css'
        less: '<%= dirs.less %>/boldy_boot.less'
        js: [
          '<%= dirs.vendor %>/jquery-cookie/jquery.cookie.js'
          '<%= src.output.bootstrap.js %>'
          '<%= dirs.vendor %>/scroll-to-top/jquery.scrollToTop.min.js'
          '<%= dirs.js %>/js/post.js'
          '<%= dirs.vendor %>/async-gravatars/async-gravatars.js'
          '<%= dirs.vendor %>/jquery-colorbox/jquery.colorbox-min.js'
          '<%= dirs.vendor %>/nwxforms/src/nwxforms.js'
          '<%= dirs.js %>/boldy.js'
        ]


    # Banner
    # ------
    banner:
      'css': '''
        /*!
         * Boldy for Dotclear v<%= pkg.version %>.
         *
         * Original theme by Site5 (http://www.s5themes.com) under GPLv2 license.
         *
         * Ported on Dotclear by <%= pkg.author %> (<%= pkg.homepage %>).
         * Copyright 2012-<%= grunt.template.today("yyyy") %> <%= pkg.author %>.
         *
         * Using the CSS framework Bootstrap under MIT license.
         */
      '''

      'js': '''
        /*!
         * Boldy for Dotclear v<%= pkg.version %> by <%= pkg.author %> (<%= pkg.homepage %>).
         * Copyright 2012-<%= grunt.template.today("yyyy") %> <%= pkg.author %>.
         *
         * Using:
         *   - Async Gravatars under MIT license.
         *   - HeadJS under MIT license.
         *   - jQuery under MIT license.
         *   - jQuery ColorBox under MIT license.
         *   - jQuery scrollToTop under MIT license.
         *   - nwxforms under MIT license.
         *   - Respond under MIT license.
         */
      '''





    # ================================= Task ================================= #

    # Bower
    # -----
    bower:
      install:
        options:
          targetDir: '<%= dirs.vendor %>'
          cleanTargetDir: true
          layout: 'byComponent'
          install: true
          copy: false
          verbose: true


    # Concatenation for JS
    # --------------------
    concat:
      bootstrap:
        src: '<%= src.input.bootstrap.js %>'
        dest: '<%= src.output.bootstrap.js %>'


    # LESS
    # ----
    less:
      boldy:
        options:
          compress: true
          cleancss: true
          report: 'gzip'
          strictImports: true
        files:
          '<%= src.output.boldy.css.screen %>': '<%= src.input.less %>'

      debug:
        options:
          compress: false
          cleancss: false
          report: 'none'
          strictImports: true
        files:
          '<%= src.output.boldy.css.screen %>': '<%= src.input.less %>'

      bootstrap:
        options:
          compress: true
          cleancss: true
          report: 'gzip'
          strictImports: true
        files:
          '<%= src.output.bootstrap.css %>': '<%= src.input.bootstrap.less %>'


    # Watcher for LESS files
    # ----------------------
    watch:
      boldy:
        files: ['<%= dirs.less %>/*.less']
        tasks: [
          'less:debug'
          'lesslint'
        ]
        options:
          spawn: false


    # CSSmin for indefero
    # -------------------
    cssmin:
      indefero:
        options:
          report: 'gzip'
        files:
          '<%= src.output.boldy.css.indefero %>': '<%= src.input.indefero %>'


    # Uglify the JS files
    # -------------------
    uglify:
      boldy:
        options:
          report: 'gzip'
          banner: '<%= banner.js %>'
        files:
          '<%= src.output.boldy.js %>': '<%= src.input.js %>'


    # Banner for LESS
    # ---------------
    usebanner:
      boldy:
        options:
          banner: '<%= banner.css %>'
        files:
          src: '<%= src.output.boldy.css.screen %>'


    # LessLint
    #---------
    lesslint:
      src: [
        '<%= src.input.less %>'
      ]
      options:
        csslint:
          '<%= csslintrc %>'


    # JSHint
    # ------
    jshint:
      boldy:
        options:
          jshintrc: true
        files:
          src: [ '<%= dirs.js %>/boldy.js' ]





  # ============================== Load plugins ============================== #
  grunt.loadNpmTasks 'grunt-bower-task'
  grunt.loadNpmTasks 'grunt-contrib-concat'
  grunt.loadNpmTasks 'grunt-contrib-less'
  grunt.loadNpmTasks 'grunt-contrib-watch'
  grunt.loadNpmTasks 'grunt-contrib-cssmin'
  grunt.loadNpmTasks 'grunt-contrib-uglify'
  grunt.loadNpmTasks 'grunt-banner'
  grunt.loadNpmTasks 'grunt-lesslint'
  grunt.loadNpmTasks 'grunt-contrib-jshint'





  # ============================= Callable tasks ============================= #
  grunt.registerTask 'w',           'watch:boldy'
  grunt.registerTask 'indefero',    'cssmin:indefero'

  grunt.registerTask 'bootstrap', [
    'concat:bootstrap'
    'less:bootstrap'
  ]

  grunt.registerTask 'lint', [
    'lesslint'
    'jshint'
  ]
  grunt.registerTask 'check', 'lint'
  grunt.registerTask 'qa',    'lint'

  grunt.registerTask 'default', [
    'bootstrap'
    'boldy'
  ]
  grunt.registerTask 'boldy', [
    'lint'
    'less:boldy'
    'usebanner:boldy'
    'uglify:boldy'
    'indefero'
  ]

  grunt.registerTask 'full', [
    'bower'
    'default'
  ]
  grunt.registerTask 'all', 'full' # Alias

package.json

{
  "name": "Boldy",
  "version": "1.1.5",
  "description": "The Boldy theme for Dotclear",
  "repository": {
    "type": "git",
    "url": "git@projects.llaumgui.com:llaumgui-com.git"
  },
  "author": "Guillaume Kulakowski",
  "homepage": "http://www.llaumgui.com",
  "devDependencies": {
    "bower": "latest",
    "grunt": "latest",

    "grunt-bower-task": "latest",
    "grunt-contrib-watch": "latest",

    "grunt-contrib-uglify": "latest",
    "grunt-contrib-concat": "latest",
    "grunt-contrib-cssmin": "latest",
    "grunt-contrib-less": "latest",

    "grunt-banner": "latest",

    "grunt-contrib-jshint": "latest",
    "grunt-lesslint": "latest"
  }
}