Moving to AdminLTE

Moving default interface to AdminLTE

 * [x] Layout
 * [x] Menu
 * [x] Assets (requires Bower...)
 * [x] Templates
    * [x] List
        * [x] ListBuilder
        * [x] FiltersBuilder
        * [x] ResultsBuilder
        * [x] RowBuilder
        * [x] Object actions
        * [x] Batch actions
        * [x] Generic actions
        * [x] Scopes
    * [x] Show
        * [x] ShowBuilder
        * [x] Sidebar
        * [x] Tabs
    * [x] New
    * [x] Edit
    * [x] Action
 * [x] Forms
 * [x] Javascripts
    * [x] Object actions (List, Show, Edit)
    * [x] Batch actions
    * [x] Generic actions
    * [x] Tabs
    * [x] iCheck
 * [x] Filters customizable:
    * [x] By default, on right
    * [x] Option "on top"
 * [x] ~~Nested List implemented in a second time once discussion #42  is closed (and #38)?~~
 * [x] Basic nested list implementation
 * [x] ~~Login page ?~~
 * [x] Update documentation
    * [x] Assets and Bower
    * [x] ~~Twig Blocks ?~~
    * [x] Customize templates
 * [x] Moving old templates to a dedicated bundle

Feebacks after PR ready:

 * [x] Scopes design to do
 * [x] Excel list action button design
 * [x] Pagination integration when there is no filters and only one page
 * [x] Tree indentation on nested_list. See comment below
 * [x] ~~Edge cases. See comment below~~
 * [x] Auto-expand menu. See comment below
 * [x] Flashes