Fixed issue with RSS Validator.

Some issue with the RSS Validator can't be fixed since the user build a
post by writing HTML code (RSS Validator says there shouldn't be HTML
tags in the content.)
Changed navigation bar to be a <nav> element
Merge branch 'master' of github.com:pothibo/ecrire
Modified Administration flash content and CSS.

Also added a small javascript effect so the save is now dismissed after
2 seconds.
Removed obsolete actions.
New base controller that implements Warden::Manager

Because Warden helpers do not really handle controller actions, I had to
build my own manager -> proxy builder.

There may be a better solution to this one but I am currently using
basic Warden settings so I didn't really need anything fancy.

This BaseControllerTest should be used by every functional test as
some environment do need to be set with the way I use Warden
Removed obsolete test and some comments
Initial testing for posts controller
Added more testing to the posts controller
First stab at testing controllers.

This was obviously overdue.
Made changes so every controller reuse the same warden code
More tests!
Only send user's ID in the cookie
Merge branch 'master' into marmite