API method rename (createSurfaceProvider to getSurfaceProvider)

[James Fung]

Hi everyone,

CameraView-1.0.0 Alpha16 includes an API change that renames a method.  Applications will need to be updated to use the new method name. 

Specifically, createSurfaceProvider() is renamed to getSurfaceProvider().  Additionally, the same Preview.SurfaceProvider instance will be returned each time it's called, instead of returning a new instance every time.

Usages like:

Preview.SurfaceProvider surfaceProvider = previewView.createSurfaceProvider(); 

should be replaced with):
Preview.SurfaceProvider surfaceProvider = previewView.getSurfaceProvider();

CameraView is in Alpha but widely used and we appreciate your patience as we stabilize the API.  Thanks!