Update LastUgpradeCheck in HockeySDK project.

Schemes were updated in 85f2f66, but the same change in project.pbxproj
was forgotten.  Fix this and silence the upgrade warning.
Merge pull request #27 from vslavik/xcode5-upgrade

Update LastUgpradeCheck in HockeySDK project.
Merge commit 'cd1198d2678e90372bd5cc5229c97599f5f548a0' into develop

* commit 'cd1198d2678e90372bd5cc5229c97599f5f548a0':
  Update LastUgpradeCheck in HockeySDK project.