Added method to check if device has a physical camera.
Renamed method physical_camera to available in camera_wrapper.
Merge pull request #336 from michaelkoper/physical-camera-features

Added method to check if device has a physical camera.
Do not show warnings about iOS when building for OSX
Merge pull request #338 from y8/patch-1

Do not show warnings about iOS when building for OSX
Merge branch 'refs/heads/master' into uiactivityviewcontroller

* refs/heads/master:
  Do not show warnings about iOS when building for OSX
  Renamed method physical_camera to available in camera_wrapper.
  Added method to check if device has a physical camera.