Allow filtering Group objects by is_personal in admin screens.
Askbot-site-setting: number of questions per page: added new option
'20'.
Merge pull request #264 from knowledgepoint-devs/modal

Allow 20 questions per page option
Fixed 500 error "Related Field has invalid lookup: icontains" when
searching Group objects in admin screens.
Merge pull request #265 from knowledgepoint-devs/modal

Fixed 500 error "Related Field has invalid lookup: icontains" when
fixed negation bug in joining preapproved groups when email is validated
Merge branch 'modal' of github.com:ASKBOT/askbot-devel into modal
TYPE_ACTIVITY_ASK_TO_JOIN_GROUP is an Activity.activity_type that's
being used to create Activity objects but it's not been included in that
field's choices tuple! It is now. This means that in the admin list view
of Activity model we can now filter by this activity type.
implemented make thread private feature
added explicit ASKBOT_PARNTER_SITE_IDS setting to the settings.py file
merged the modal branch
allow bulk deletion of content by user upon blocking
Merge remote-tracking branch 'upstream/modal' into modal
Add missing word
Merge pull request #266 from mgeisler/patch-1

Add missing word
made it impossible to reveal identity of asker by someone else editing the question
added setting ASKBOT_AGGREGATOR_SITE_IDS for the multisite setup
added signal sending on posting question by email
fixed a bug in the Space.get_default_ask_group_id
Added translation support for "Save" button in site settings and group settings (issue #268)