Merge pull request #73 from Soulou/internationalization

Select language according to http accept-language parameter
Merge pull request #87 from Soulou/fix_admin_bo

Fix coffee syntax EINDENT error
base backoffice
my profile link
Add candidates comparison frequency on candidates backoffice
Basic profil edition of a candidate
Renaming of candidate resource by my_profile and css modification on the basic profil edition form
Fixed the text height problem using the rows attribute
Check ability to modify my profile with CanCan
Basic index of a candidate's propositions
Basic index of a candidate's elections and of his propositions for that election
User to candidacy link for the backoffice
Improved the protected methods for the proposition controller and added new proposition creation
Creation of a candidacy's profile if none existed
Basic tag selection using select2 gem
Form code factorization and basic embed suppression
Basic embed addition
End of line newline addition
Corrected embed addition
Bugs fixe for adding and removing embeds