[IAEP] [RELEASE] activities.sugarlabs.org v2

[Aleksey Lim]

Hi all,

Key features after merging/adapting upstream code:

* new addon type Content(.xol bundles)
  addon's version will be incremented on each uploading

* use bundle_id for activity GUID
  it should prevent creating two addons for the same activity

* Application field should be filled for addon versions before
  completing/nominating

* search panel was reverted

* RSS was fixed

* share links on digg/delicious/etc

* broadcast events for editors/admins
  on every review-request email will be sent to all subscribers
  to enable this feature use "Broadcast events" checkbox
  on http://activities.sugarlabs.org/users/edit#profile-notifications

-- 
Aleksey