CAS User - One class to rule them all

Create sfUTCCASUser that extends sfGuardSecurityUser
Use the methods of election/lib/myUser
Disable remember_me for CAS login. You can now use the logout function !!!

Signed-off-by: Emilien Kenler <hello@emilienkenler.com>
Send return url to CAS

Signed-off-by: Emilien Kenler <hello@emilienkenler.com>
Clean logout link - see #36

Signed-off-by: Emilien Kenler <hello@emilienkenler.com>
Default url parameter for sfUTCCASUser::logout()

Signed-off-by: Emilien Kenler <hello@emilienkenler.com>
Merge pull request #35 from MiLk/cas-user

CAS User - One class to rule them all