Added the tenant object to the User, Group and Content model.
All the search feeds should now output a tenant object as well.
Merge branch 'master' into tenant-in-objects

* master:
  Documentation modifications
  Simpler sort comparator for sorting skin sections.
  Sort UI Skin sections
  Removed timeout
  Added sections and subsection for LESS file
  Misc fixes
  Added /api/ui/skin as a global admin endpoint
Renamed 'tenant' to 'tenantAlias' in Cassandra CFs

Renamed in Principals and Content CF.
Added some more tests for the tenant object as returned from the REST
endpoints.
Only producing content search documents if the content item still exists.
Merged master.
Fixed failing unit tests since user.tenant now returns an object rather than the alias.
Made isArray a member function of Validator objects.
Merge pull request #461 from simong/validator-isArray

Made isArray a member function of Validator objects.
Merge pull request #438 from stuartf/pp-image-types

Support more PP image types
Merge branch 'tenant-in-objects' of git://github.com/simong/Hilary into tenant-in-objects
Remove unused require
Documentation page
Fix indentation in oae-doc module.
(TravisCI) Adding workaround for Cassandra ipv6, fixing test race
condition
Increased timeout when starting tests because of intermittent failures
log authentications
code review issues