Fix for rails_admin using Rails 4.1

rails_admin.scss.erb

//= depend_on_asset "rails_admin/bootstrap/glyphicons-halflings.png"
//= depend_on_asset "rails_admin/bootstrap/glyphicons-halflings-white.png"
//= depend_on_asset "rails_admin/aristo/images/bg_fallback.png"
//= depend_on_asset "rails_admin/aristo/images/ui-icons_222222_256x240.png"
//= depend_on_asset "rails_admin/aristo/images/ui-icons_454545_256x240.png"
//= depend_on_asset "rails_admin/aristo/images/icon_sprite.png"
//= depend_on_asset "rails_admin/aristo/images/slider_handles.png"
//= depend_on_asset "rails_admin/aristo/images/progress_bar.gif"
//= depend_on_asset "rails_admin/multiselect/icon_sprite.png"
//= depend_on_asset "rails_admin/multiselect/ui-icon-circle-triangle-n-light.png"
//= depend_on_asset "rails_admin/multiselect/ui-icon-circle-triangle-n-dark.png"
//= depend_on_asset "rails_admin/multiselect/ui-icon-circle-triangle-s-light.png"
//= depend_on_asset "rails_admin/multiselect/ui-icon-circle-triangle-s-dark.png"
//= depend_on_asset "rails_admin/colorpicker/select2.png"
//= depend_on_asset "rails_admin/colorpicker/custom_background.png"
//= depend_on_asset "rails_admin/colorpicker/colorpicker_overlay.png"
//= depend_on_asset "rails_admin/colorpicker/colorpicker_select.gif"
//= depend_on_asset "rails_admin/colorpicker/custom_indic.gif"
//= depend_on_asset "rails_admin/colorpicker/custom_hex.png"
//= depend_on_asset "rails_admin/colorpicker/custom_rgb_r.png"
//= depend_on_asset "rails_admin/colorpicker/custom_rgb_g.png"
//= depend_on_asset "rails_admin/colorpicker/custom_rgb_b.png"
//= depend_on_asset "rails_admin/colorpicker/custom_hsb_h.png"
//= depend_on_asset "rails_admin/colorpicker/custom_hsb_s.png"
//= depend_on_asset "rails_admin/colorpicker/custom_hsb_b.png"
//= depend_on_asset "rails_admin/colorpicker/custom_submit.png"

@charset "UTF-8";

<%
  theme = ENV['RAILS_ADMIN_THEME'] || :default
%>

/***  Variables  ***/

@import "rails_admin/bootstrap/variables";
@import "rails_admin/base/variables";
@import "rails_admin/themes/<%= theme %>/variables";
@import "rails_admin/custom/variables";

/***  Mixins  ***/

@import "rails_admin/bootstrap/mixins";
@import "rails_admin/base/mixins";
@import "rails_admin/themes/<%= theme %>/mixins";
@import "rails_admin/custom/mixins";

/*** Reset ***/
@import "rails_admin/bootstrap/reset";
/***  Libraries  ***/

@import "rails_admin/aristo/jquery-ui-1.8.7.custom";
@import "rails_admin/jquery.ui.timepicker";
@import "rails_admin/ra.calendar-additions";
@import "rails_admin/ra.filtering-multiselect";
@import "rails_admin/ra.widgets";
@import "rails_admin/jquery.colorpicker";

/*** Font-awesome ***/

@import 'font-awesome';
@import 'rails_admin/base/font-awesome-4-compability';

/***  Bootstrap Theming  ***/

@import "rails_admin/bootstrap/scaffolding";
@import "rails_admin/bootstrap/grid";
@import "rails_admin/bootstrap/layouts";
@import "rails_admin/bootstrap/type";
@import "rails_admin/bootstrap/forms";
@import "rails_admin/bootstrap/tables";
@import "rails_admin/bootstrap/dropdowns";
@import "rails_admin/bootstrap/wells";
@import "rails_admin/bootstrap/component-animations";
@import "rails_admin/bootstrap/close";
@import "rails_admin/bootstrap/buttons";
@import "rails_admin/bootstrap/button-groups";
@import "rails_admin/bootstrap/alerts";
@import "rails_admin/bootstrap/navs";
@import "rails_admin/bootstrap/navbar";
@import "rails_admin/bootstrap/breadcrumbs";
@import "rails_admin/bootstrap/pagination";
@import "rails_admin/bootstrap/pager";
@import "rails_admin/bootstrap/modals";
@import "rails_admin/bootstrap/tooltip";
@import "rails_admin/bootstrap/popovers";
@import "rails_admin/bootstrap/thumbnails";
@import "rails_admin/bootstrap/labels-badges";
@import "rails_admin/bootstrap/progress-bars";
@import "rails_admin/bootstrap/accordion";
@import "rails_admin/bootstrap/carousel";
@import "rails_admin/bootstrap/hero-unit";
@import "rails_admin/bootstrap/utilities";

/***  RailsAdmin Theming  ***/

@import "rails_admin/base/theming";
@import "rails_admin/themes/<%= theme %>/theming";
@import "rails_admin/custom/theming";