Improves custom route management

Custom routes work in /m mode
Improves security for user variable inputs
Insertion of CSS through retriever is fixed

No need to specify the CSS and JS variable in themes anymore
Wrong variable used in News app for deletion message
Extended list of accepted HTML markups
Happy new year!
Bootstrap also loaded for print
Forgotten $page_title in _blank theme
Added a new function to get the client's IP
Updating bootstrap from 3.0.0 to 3.0.3
Merge remote-tracking branch 'origin/0.4' into installer-reloaded
Updating installer to use BS 3.0.3 instead of 3.0.0