Added the CameraScanner class
Added two all-zero edges in the integral image
Updated HaarFeature to work with the new integral image
In-place updating of the integral image
Merge branch 'optimization' into refactoring
Move findInt to IntegralImage and rename it to integral
Remove rgb member; use srcImage.getHeight/Width in updateSrcImage
Change internal image representation of IntegralImage to 2d array
Optimize IntegralImage#integrateImage(double[][])
Minor refactorizations to IntegralImage#updatesrcImage
Rename IntegralImage#updateSrcImage to setSrcImage
Make Integralage#width and #height private; add getters
Move findIntS to IntegralImage and rename it to integralOfSquare
Remove xy and xyS methods

They are no longer needed since they were only referenced within
IntegralImage and the internal data structure is now a 2d array
Add testPerformance method to ImageScanner
Add Common class with debugPrint method
Make it easy to switch between recognition/speed test
Print error message to STDERR instead of STDOUT
Remove some TODO comments
Replace empty catch blocks with throws declarations