Added swift mailer and jgrowl libraries.
Updated user management to allow reset by administrators and activation by e-mail, still WIP.
Updated icons, CSS and user views.
Fix error in User model validations and added flash messages in the controllers.
Removed wrongly added files for jGrowl.
Added flash messages support into the main layout.
Added flash messages in existing controllers.
Finished adding user management code, still needs to be properly tested but should be all.
Fix for minor error: missing jgrowl css file inclusion.