Change TalkTalk VOD picks group identifier to TTIMAGE2
Log and continue on error in TalkTalkVodContentListUpdateTask
Picks update controller

Add a controller at /system/update/picks/date/channelId
that allows picks to be updated for a particular channel.
Aids in debugging problems with picks.
Merge pull request #458 from atlasapi/picks-day-updater-controller

Picks update controller
Merge pull request #455 from atlasapi/unmerged-schedule

Unmerged schedule
Merge pull request #457 from atlasapi/title-subset-equiv

Title subset equivalence scorer
Return status 200 and change to a POST
Improve ScheduleController error message when key and source missing

It's an error not to provide a publisher or API key to /schedule but
resulting message was "Need precedence enabled" didn't described that
very well. If neither param is supplied then "You must supply a
publisher or API key" is displayed.

If an API key without precedence is supplied without a publishers then
the original message is displayed.
Merge branch 'improve-schedule-controller' into stage

* improve-schedule-controller:
  Improve ScheduleController error message when key and source missing
  Return status 200 and change to a POST
  Picks update controller
  Log and continue on error in TalkTalkVodContentListUpdateTask
  Change TalkTalk VOD picks group identifier to TTIMAGE2

Conflicts:
	src/main/java/org/atlasapi/remotesite/metabroadcast/picks/PicksChannelDayUpdateController.java