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Update to version 0.6.2

As it do not work with django 1.7

Add SqlAuthUser and LdapAuthUser auth classes. Deprecate the usage of SqlAuthUser in favor of SqlAuthUser.

SqlAuthUser use django databases management, and thus is compatible with all SQL databases supported
by django: postgresql, mysql, sqlite3 and oracle.

LdapAuthUser use the full pythonic ldap3 module

If the identity provider CAS do not return an XML document as specified on ticket validation,
an XML parsing error is raised. We now catch it and display a message to the user.

Merge dev into master

It prevent the next login attemps to fail because of bad LT