Fix crash in image cache when SoftReference is null

Adding a getBitmap() method in MovieImagebase to check
the nullity of "image"
First implementation of search in app

SearchableActivity is using a mock result
Merge branch 'master' of github-slvn:eyal-lezmy/Android-Lab-Devoxx-2013 into dev

Conflicts:
	SampleApp/Android-DataLib-Sample-Netflix/AndroidManifest.xml
	SampleApp/Android-DataLib-Sample-Netflix/res/values/strings.xml