Fix case of autotimer.h include in autotimer.cpp.
Only output device info when it is requested. Make it a public method.
Add include guards on header files.
Expand benchmark into a benchmark suite which runs upon multiple images and provides more information. Resolves #5.
Merge pull request #17 from jaredmolson84/master

Add fixes to the Sobel kernel so that it properly computes direction angle
A megapixel is 1,000,000px, not 1024*1024=2^20 pixels.