MOSYNC-3049 Create CustomPicker widget idl and wrapper
MOSYNC-3053Implement CustomPicker on iOS platform
MOSYNC-3089 Create idl constants and wrapper methods for CustomPicker properties
MOSYNC-3090 Implement CustomPicker properties on iOS platoform
Merge remote-tracking branch 'emma/customPicker' into customPicker
MOSYNC-3054 Create CustomPicker test app
Merge remote-tracking branch 'bogdan/customPicker' into customPicker
MOSYNC-3092 CustomPicker properties on Android.