Merge remote-tracking branches 'degate/master' and 'origin/master'
Merge remote-tracking branch 'origin/master'
insert otsu algorithm.
otsu algorithm can find threshold automatically.
TileImage_GS_DOUBLE_shptr type variable is needed for parameter.
for region management, convert grayscale image to binary image
using otsu algorithm and extract edge from binary image.
some test code in WireMatching.cc
modify some indent for consistency of codes. and add Region class.
complete making RegionList object.
improvement of making regions
Merge pull request #18 from xorrhks0216/region_find

Improved regions handling, added otsu algorithm