Compile error in PNGSaver fixed
Small change to PNG hotfix
Merge pull request #47 from Madnebular/hotfix/png

Use sizeof instead of png_sizeof
Fix usage of FeatureMatch.h

	modified:   CMakeLists.txt
	modified:   math/sac/EssentialSAC.h
	modified:   math/sac/HomographySAC.h
	modified:   vision/Feature2DROC.h