fixes ImageWindowIterator bug
adds imaewindowiterator tests
removes ceil
changes imagewindowiterator tests
adds hog dalaltriggs test
removes ceil and floor from dalaltriggs
removes useless comments from hog.cpp
zhuramanan n_channels test
adds igo, es and lbp n_channels tests
adds es and igo values tests
adds lbp values test
adds lbp values test II
fixes round in zhuramanan test
adds constrain_landmarks test
improves doc
Merge pull request #278 from nontas/features_fix

Features bugfix and tests