* started workin on 'navbar' module
* changed bootstrap theme to bootswatch/Simplex
* big work on navbar logic
* starting creating menus using navbar
* converted app views to new Wepage decorator, updated navbar
* reimplemented DernieresMaraudes as a dropdown instead of ContextMixin
* reorganised static files, minor code cleanups
* turned Link.href into lazy-evaluated property
* collapsed 'navbar' module into 'website', dynamic building of ApplicationMenu subclasses
* minor cleanup
* blah blah blah
* added way to add admin/non-admin links
* minor style change : red border for active page instead of all dropdowns
* deleted file
* prepare adding removing menu templates files, being replaced by code
* essayé de généraliser le code pour les modaux bootstrap, non testé git status
* more preparation and thinking on navbar app_menus logic...
* added LinkManager and DropdownManager, getting closer...
* small fix in DropdownManager.__get__
* boosted up work: keep it simple so it can be merged fast, major layout changes
* added month filter on maraudes:liste
* added 'as_icon' filter to display boolean/null values as bootstrap icons
* remove inactive user from planning selection
* removed all unused 'menu' templates
* set up django_select2 to use static files
* small fix after review
