Added more error handling in Apple Feedback service.  Closes #166
Missed a file in commit for #166
Added comment explaining channel and endpoint
Set max auto scale channels for apple to 20 based on their own documented limits
Removed duplicate lock in the ApplePushChannel as per #171
Merge pull request #170 from RobGibbens/patch-1

Added comment explaining channel and endpoint
Added WithData fluent helper for GCM to assist in Json data additions.  Closes #160
Merge branch 'master' of git://github.com/Redth/PushSharp