Possible 'correct' implementation of handlebars in yeoman+grunt. Not sure.

Gruntfile.js

'use strict';
var lrSnippet = require('grunt-contrib-livereload/lib/utils').livereloadSnippet;
var mountFolder = function (connect, dir) {
    return connect.static(require('path').resolve(dir));
};

// # Globbing
// for performance reasons we're only matching one level down:
// 'test/spec/{,*/}*.js'
// use this if you want to match all subfolders:
// 'test/spec/**/*.js'

module.exports = function (grunt) {

    
    // load all grunt tasks
    grunt.loadNpmTasks('grunt-contrib-handlebars');
    require('matchdep').filterDev('grunt-*').forEach(grunt.loadNpmTasks);

    // configurable paths
    var yeomanConfig = {
        app: 'app',
        dist: 'dist'
    }
    , appNamespace = 'helloBackbone' // !! Not sure how to drive app namespace ;

    var handlebarsConfig = {

        compile: {

            files: {
              "<%= yeoman.app %>/scripts/templates.compiled.js": [
                "<%= yeoman.app %>/scripts/templates/*.hbs",
                "<%= yeoman.app %>/scripts/templates/*.handlebars"
              ]
            },

            options: {
              namespace: appNamespace+'.Templates',
              wrapped: true, 
              processName: function(filename) {
                
                return filename
                        .replace(/^app\/scripts\/templates\//, '')
                        .replace(/\.hbs$/, '')
                        .replace(/\.handlebars$/, '');
              }
            }
      }};


    grunt.initConfig({
        yeoman: yeomanConfig,
        handlebars: handlebarsConfig,
        watch: {
            coffee: {
                files: ['<%= yeoman.app %>/scripts/{,*/}*.coffee'],
                tasks: ['coffee:dist']
            },
            handlebars: {
                files: [
                  'app/scripts/templates/*.hbs',
                  'app/scripts/templates/*.handlebars'
                ],
                tasks: 'handlebars reload'
            },
            coffeeTest: {
                files: ['test/spec/{,*/}*.coffee'],
                tasks: ['coffee:test']
            },
            compass: {
                files: ['<%= yeoman.app %>/styles/{,*/}*.{scss,sass}'],
                tasks: ['compass']
            },
            livereload: {
                files: [
                    '<%= yeoman.app %>/*.html',
                    '{.tmp,<%= yeoman.app %>}/styles/{,*/}*.css',
                    '{.tmp,<%= yeoman.app %>}/scripts/{,*/}*.js',
                    '<%= yeoman.app %>/images/{,*/}*.{png,jpg,jpeg,gif,webp}'
                ],
                tasks: ['livereload']
            },
            jst: {
                files: [
                    '<%= yeoman.app %>/scripts/templates/*.ejs'
                ],
                tasks: ['jst']
            }
        },
        connect: {
            options: {
                port: 9000,
                // change this to '0.0.0.0' to access the server from outside
                hostname: 'localhost'
            },
            livereload: {
                options: {
                    middleware: function (connect) {
                        return [
                            lrSnippet,
                            mountFolder(connect, '.tmp'),
                            mountFolder(connect, 'app')
                        ];
                    }
                }
            },
            test: {
                options: {
                    middleware: function (connect) {
                        return [
                            mountFolder(connect, '.tmp'),
                            mountFolder(connect, 'test')
                        ];
                    }
                }
            },
            dist: {
                options: {
                    middleware: function (connect) {
                        return [
                            mountFolder(connect, 'dist')
                        ];
                    }
                }
            }
        },
        open: {
            server: {
                path: 'http://localhost:<%= connect.options.port %>'
            }
        },
        clean: {
            dist: ['.tmp', '<%= yeoman.dist %>/*'],
            server: '.tmp'
        },
        jshint: {
            options: {
                jshintrc: '.jshintrc'
            },
            all: [
                'Gruntfile.js',
                '<%= yeoman.app %>/scripts/{,*/}*.js',
                '!<%= yeoman.app %>/scripts/vendor/*',
                'test/spec/{,*/}*.js'
            ]
        },
        mocha: {
            all: {
                options: {
                    run: true,
                    urls: ['http://localhost:<%= connect.options.port %>/index.html']
                }
            }
        },
        coffee: {
            dist: {
                files: [{
                    // rather than compiling multiple files here you should
                    // require them into your main .coffee file
                    expand: true,
                    cwd: '<%= yeoman.app %>/scripts',
                    src: '*.coffee',
                    dest: '.tmp/scripts',
                    ext: '.js'
                }]
            },
            test: {
                files: [{
                    expand: true,
                    cwd: '.tmp/spec',
                    src: '*.coffee',
                    dest: 'test/spec'
                }]
            }
        },
        compass: {
            options: {
                sassDir: '<%= yeoman.app %>/styles',
                cssDir: '.tmp/styles',
                imagesDir: '<%= yeoman.app %>/images',
                javascriptsDir: '<%= yeoman.app %>/scripts',
                fontsDir: '<%= yeoman.app %>/styles/fonts',
                importPath: 'app/components',
                relativeAssets: true
            },
            dist: {},
            server: {
                options: {
                    debugInfo: true
                }
            }
        },
        
        uglify: {
            dist: {
                files: {
                    '<%= yeoman.dist %>/scripts/main.js': [
                        '<%= yeoman.app %>/scripts/templates.compiled.js',
                        '<%= yeoman.app %>/scripts/models/*.js',
                        '<%= yeoman.app %>/scripts/collections/*.js',
                        '<%= yeoman.app %>/scripts/routes/*.js',
                        '<%= yeoman.app %>/scripts/views/*.js',
                        '<%= yeoman.app %>/scripts/main.js'
                    ],
                }
            }
        },
        useminPrepare: {
            html: '<%= yeoman.app %>/index.html',
            options: {
                dest: '<%= yeoman.dist %>'
            }
        },
        usemin: {
            html: ['<%= yeoman.dist %>/{,*/}*.html'],
            css: ['<%= yeoman.dist %>/styles/{,*/}*.css'],
            options: {
                dirs: ['<%= yeoman.dist %>']
            }
        },
        imagemin: {
            dist: {
                files: [{
                    expand: true,
                    cwd: '<%= yeoman.app %>/images',
                    src: '{,*/}*.{png,jpg,jpeg}',
                    dest: '<%= yeoman.dist %>/images'
                }]
            }
        },
        cssmin: {
            dist: {
                files: {
                    '<%= yeoman.dist %>/styles/main.css': [
                        '.tmp/styles/{,*/}*.css',
                        '<%= yeoman.app %>/styles/{,*/}*.css'
                    ]
                }
            }
        },
        htmlmin: {
            dist: {
                options: {
                    /*removeCommentsFromCDATA: true,
                    // https://github.com/yeoman/grunt-usemin/issues/44
                    //collapseWhitespace: true,
                    collapseBooleanAttributes: true,
                    removeAttributeQuotes: true,
                    removeRedundantAttributes: true,
                    useShortDoctype: true,
                    removeEmptyAttributes: true,
                    removeOptionalTags: true*/
                },
                files: [{
                    expand: true,
                    cwd: '<%= yeoman.app %>',
                    src: '*.html',
                    dest: '<%= yeoman.dist %>'
                }]
            }
        },
        copy: {
            dist: {
                files: [{
                    expand: true,
                    dot: true,
                    cwd: '<%= yeoman.app %>',
                    dest: '<%= yeoman.dist %>',
                    src: [
                        '*.{ico,txt}',
                        '.htaccess',
                        'images/{,*/}*.{webp,gif}'
                    ]
                }]
            }
        },
        bower: {
            all: {
                rjsConfig: '<%= yeoman.app %>/scripts/main.js'
            }
        },
        jst: {
            compile: {
                files: {
                    '.tmp/scripts/templates.js': ['<%= yeoman.app %>/scripts/templates/*.ejs']
                }
            }
        }
    });

    grunt.renameTask('regarde', 'watch');

    grunt.registerTask('server', function (target) {
        if (target === 'dist') {
            return grunt.task.run(['build', 'open', 'connect:dist:keepalive']);
        }

        grunt.task.run([
            'clean:server',
            'coffee:dist',
            'jst',
            'compass:server',
            'livereload-start',
            'connect:livereload',
            'open',
            'watch'
        ]);
    });

    grunt.registerTask('test', [
        'clean:server',
        'coffee',
        'jst',
        'compass',
        'connect:test',
        'mocha'
    ]);

    grunt.registerTask('build', [
        'clean:dist',
        'coffee',
        'handlebars',
        'jst',
        'compass:dist',
        'useminPrepare',
        'imagemin',
        'htmlmin',
        'concat',
        'cssmin',
        'uglify',
        'copy',
        'usemin'
    ]);

    grunt.registerTask('default', [
        'jshint',
        'test',
        'build'
    ]);
};