Remove reference to old get_host method.
Tickets: Adapting backends from the KTHse/django-cas2 fork.

This allows the cas_tgt table to be populated.

Cf. https://github.com/KTHse/django-cas2/blob/master/django_cas/backends.py
Debugging: Exposing reason for CasTicketException in get_proxy_ticket_for().
Remove reference to old get_host method.
Tickets: Adapting backends from the KTHse/django-cas2 fork.

This allows the cas_tgt table to be populated.

Cf. https://github.com/KTHse/django-cas2/blob/master/django_cas/backends.py
Debugging: Exposing reason for CasTicketException in get_proxy_ticket_for().
_login_url: lowercasing "true" in gateway param.
logout_url: Supporting CAS_PROVIDE_URL_TO_LOGOUT to avoid 2.3.1 recommendation.
README: Updating links, and owning the fork.
README: Crediting django-cas2.
Merge pull request #15 from kstateome/bugfix/django_1_5

Remove reference to old get_host method.
Merge pull request #16 from amiato/proxy-ticket-fixes

Proxy ticket fixes
Merge pull request #19 from amiato/master

_login_url: lowercasing "true" in gateway param.
Documentation update
Install docs; Contrib docs;
Merge pull request #18 from kstateome/develop

Release 0.9.0