Merge pull request #6 from vebers/develop

Mac OS X keyboard support for classifychars utility
Fixed clock timing on Windows.
Previously, clock timing was mocked out to 0.  This fixes it and gives
correct timings in ms for plate recognitions
Moved timing prototype definition out of Windows only code block
Added error message when input image/video file is not found
Fixed segfault when calculating median against empty array
Increased recognition speed for plate region analysis by 2.5x.
Reduced number of thresholded images from 10 to 4.  Accuracy (based on current benchmarks) is about the same, but recognition speed for a single plate region goes from ~88ms to ~40ms.
Fixed access for non existing array index in case if arraySize=0
Added missing header
Modified to relative OpenCV include path
Merge commit 'bcdb010cc5fb469b593150979a020af4cda3698a' into develop