Issue 320 - Ensure that a group or content item always has 1 member.
(CSRFReferer) Check referer on incoming requests to verify they are same-origin.
Removed unneeded testcase for issue 320
Google picture followup
Google/Twitter Picture PR followup:
 * Cassandra.constructUpsertQuery filters out keys with null/undefined values
 * Created a TenantsUtil.getBaseUrl(tenant) utility.
Merge branch 'master' into issue-400
(CSRFReferer) Fixes from review feedback
Merge pull request #320 from simong/issue-320

Sharing content with multiple people (10+) removes me as manager
Merge branch 'issue-400' of git://github.com/mrvisser/Hilary into issue-400
Merge branch 'googlefollowup' of git://github.com/simong/Hilary into googlefollowup
Added missing line break
Merge master.