Add changes to the sobel kernel. Fixed the poorly named initialization matrix for the theta buffer. Also fixed the sobel kernel so that it modifes the output range of the arc tan function to be (0, 180) degrees instead of (-90, 90) degrees.
Add changes to the Sobel kernel. Fixed issues where the angle was not being calculated or stored properly due to improper use of the atan2 function. Added debug function called GetTheta() that will read the contents of the theta angle buffer for debug purposes.
Removed debugging code from canny-opencl.cpp main function.
Removed extraneous spaces.