Merge pull request #317 from knowledgepoint-devs/merge1

New per-site setting to remember to set when setting up a new site.
Merge pull request #318 from knowledgepoint-devs/merge1

Added notes on how to control aggregation.
refactored send_email_alerts similarly to the master branch
Merge branch 'merge1' of github.com:ASKBOT/askbot-devel into merge1
clear FeedToSpace items from the database in the askbot_setup_sites command
modified askbot_setup_sites
hopefully fixed the unicode bug in use of bs4
updated minimal version requirement for beautifulsoup
for notification recipients removed filter by default site
hopefully fixed disappearance of questions when posted before logging in
bug fix
removed unused livesetting
fix for publish/unpublish answer function
added invalidation of thread post data cache upon publishing/unpublishing answer
a bugfix
hotfix for sharing question with group
Merge pull request #319 from knowledgepoint-devs/merge1

Only moderators should be able to share private questions.
added isWidget js variable to askbot data dict
Merge remote-tracking branch 'upstream/merge1' into merge1