Updated bundle
Fixed failing test
Updated bundle
Changed datatype of users.is_admin to boolean in migration
Implemented multiple file upload
Fixed layout problem that occured with very long file names
Improved can_#{permission} methods
Updated section about languages
Updated section about mail settings
Updated section about mail settings
Updated section about mail settings
Refactor method that copies permission recursively
Preparing for Rails 4
Fixed bug where header wasn't shown
Improved verticle alignment of icons