Finished implementing OpenCV code baseline
Implemented Camera Cropping and Database Saving
Changes:
- EARImageMatcher: Implemented two new methods: ExportDatabaseToXML, and ImportDatabaseFromXML:withDescriptorNames
	- Exporting returns an NSArray of strings corresponding to the names of the descriptors that were stored.
	- The naming format is simply “descriptor<i>” where i is the index of the descriptor
	- Importing takes in an NSArray of strings just like above
- Added: CameraOverLayView.xib: the overlay that goes over the camera
- Added: EARCameraOverlayView: the class of the view in the .xib file.
	- Simple subclass of UIView that passes on all touch events
- EARPatientBrowserViewController: Set the overlay view of the camera to the .xib file
	- Crop the image to the view that the user sees as well.
- InputImagesDatabase: Added new images for the database