Atom Entity changes for Activity Service.
review Comments Set 1.
added methods in Activity for XPath related changes. These need to work
for both Activity and ActivityNode. Thus overriding in Activity.
Added Comments to the methods which need to be overriden in Activity.
Merge branch 'master' into AtomEntityChanges_AS
Merge pull request #1005 from VimalDhupar/AtomEntityAS

Atom Entity changes for Activity Service.
Add new method ForumService.getCommunityForumTopics
Merge pull request #1010 from markewallace/ForumServiceGetCommunityForumTopics

New Method in Forum Service
Updated playground NSF
Merge pull request #1011 from priand/playground2

Updated playground NSF
Merge pull request #1012 from LorenzoBoccaccia/master

assembly jar uses the correct manifest
Merge pull request #1013 from LorenzoBoccaccia/master

updated notices and fixed sbt deps
fixed snippet param name in test case
Merge pull request #1015 from RajmeetBal/FixTestCasegetUpdatesFromACommunity

fixed snippet param name in test case