samples

Merge pull request #60 in CROS/samples from release/4.1 to master

* commit '8de8137e8fcc24e0beaccf216831b343cc7a5477':
  Update placeholder image
  contact service sample for iOS
  Contact service sample for android
  Added Cell Template Selector Sample for Android
  CROS-901 CROS-902
  - Added CellTemplateSelector sample for iOS. - Fixed duplicate image view in Custom Cell Style sample.