-----
* Port the client module to use pycurl instead of urllib2. This prepares the
way for SSL authentication and fixes a problem with https proxying.
* Fix bug in BodhiClient.testable()
* Update proxyclient to accept either 403 or 401 as http status codes raising
AuthErrors.
* New client.fas2.AccountSystem methods to make fasClient more efficient:
- group_data(): returns mapping group names to group type and the userids of
the administrator, sponsors, and users of the group.
- user_data(): returns mapping of userids to a username, password hash,
SSH pub key, email address, and status.
* Fix AppError exception on python-2.4
-----