fixes #155
Remove manual transactions when deleting tags.

Handling the transactions manually creates the possiblity
of unclosed transactions as reported here:
http://askbot.org/en/question/11230/errors-while-trying-to-rename-or-delete-unused-tags/

However, there's no need to do this manual handling; the simplest
solution is to just remove the decorator.

Also added tests.
Append help msg + noinput option to add_admin management command
Oauth2: Facebook: Fix email not found
Added support for directly posting as anonymous with recaptcha
Fix database connection issues in prefork mode.

When running in prefork mode, open DB connection got shared between the
child process as DB was accessed very early in the init process. One
child would then close the connection and cause others to fail. To fix
this, connection.close() was added to the end of startup procedures.
Close cache after startup procedures

Same as with DB connection, the cache connection gets shared between child
processes in prefork mode if it isn't closed after startup procedures
Fix 500 template processing error
Allow customization of the destional URL for the logo image

Chinese locale message for since you are not logged in right now ...
Updated requirements of django-celery to >=3.0.11
small changes in the group messaging js
Merge branch 'master' of github.com:ASKBOT/askbot-devel
Fix deprecation warning in HttpResponse

Replace `mimetype` by `content_type` in `HttpResponse` attributes.
see:
<https://docs.djangoproject.com/en/1.4/ref/request-response/#id5>
Merge pull request #250 from BenjaminABEL/master

Updated requirements of django-celery to >=3.0.11
Merge pull request #206 from yongjhih/fb

Oauth2: Facebook: Fix email not found
added Andrew Chen to the contribs list
Added option to allow asking without registration
Merge pull request #238 from hackingspirit/custom_logo_url_destination

Allow customization of the destional URL for the logo image
added validation to custom logo destination url
merged keto's work on better handler500