Reached dead end with OpenCV camera implementation. Plan to revert to
previous commit.
Updated graphics in MainActivity and CompletePuzzleActivity.
Added photo into database and updated CrosswordGame.
Revised image recognition code in ScanActivity, yet still problems when
text involved.
Allow for puzzles with different height and width, but cannot display.

TODO: Implement photo button functionality.
TODO: Display progress and allow for cancellation of
SavePhotoTask/ProcessTask.