Weidong An

- Heuristics costs added - bug fixed along the boundaries Result for the google logo 

Added the oriented squares filters. Added implementation for multiple kinds of filters. `google = imresize(imread('google.jpg'),0.5); mat = AMAT(google, 'shape', 'mixed');` This implementation is not working so well for setCover, but...

Bug fixed for the rotated square filters. Run the following code: `google = imresize(imread('google.jpg'),0.5); mat = AMAT(google, 'shape', 'mixed');` Result for the google logo image. 

Added implementation for combined filter by rotating the image. Run the following `mat = AMAT(google, 'shape', 'mixed2');`