Made a stripGradient module.  Copied original method in and will
start changing it soon.
implemented method to split it into vertical strips and check the 
gradient inside them, where it is near zero find the average and add
it to the histogram.  Currently untested.
tested and it works well for a single file, needs fine tuning for
multiple files though.
Updated it so that the strips sweep across the data
Merge pull request #8 from LunarLifeblood/StripGradient

Strip gradient