Hotfix : Folders slug not caught by ui-router

Regex is useless here, doesn't catch hyphens.

Fixes #3313
Put checkbox back on layer list

It was a bad idea from the start anyway.
Allow click anywhere on the item
Bugfix : Context edition in BO was broken

Nested routes were not correctly reflected in controller.
Changed layout to standard table.

Fixes #3314
Make setup easier for new apps

Some dependencies were not required in engines.
Simple form bootstrap configuration added by default.
Add some seeds.
Make engine work on sub-uri

* Define on configuration the sub-uri you are running
* Prefix every ajax call with sub uri
* Yay
Color configuration in frontend

* Add material design color list
* Normalize use of colors
* Define variables for each components
Switch from rmagick to minimagick
Add minimagick dependency
Add color variables in backend
Hotfix zoom on bounding box
Design improvements on breadcrumb
Make tabs uncheckable, PR in angular-bootstrap to come.