[DEV-1610_quick-fix] Disable AskbotUser creation on AuthUser post_save.
Merge pull request #15 from roverdotcom/DEV-1610_quick-fix

[DEV-1610_quick-fix] Disable AskbotUser creation on AuthUser post_save.
[askrover] Merge branch 'DEV-1610' into askrover

Conflicts:
	askbot/models/askbot_user.py
[askrover_no_save_signal] Disable AskbotUser-creating post_save handler. Rework AskbotUserManager.create_user to accomodate change.
[askrover_no_save_signal] Correct name of class in docstring.
[DEV-1610] Register AskbotUser in the admin (default registration - no customization).
[correct_ask_anonymousy] Correct spelling of 'anonymousy' to 'anonymously'.
[DEV-1610] Merge branch 'correct_ask_anonymousy' into DEV-1610
[DEV-1610] Register Group and GroupMembership in the admin.