Some new features

Hello,

We develop some new feature :
- Add feature to link user_cas connected user to user_ldap backend user's (require user_ldap app from OwnCloud version 7.0.1)
- Add configuration parameters to manage phpCAS client initialization (phpCAS path and debug file path)
- Add configuration parameters to disable CAS logout when user logging out from OwnCloud

We also add french translation, redesign login page with button instead of dirty CAS logo and fix presentation of settings page (CAS file inclusion was broken).

Thank's