Generic Image

• utilized image GenericImageView;
• changed ROI parameters from Point3 to Similarity2;
• added ISimilarity2 with integer values;
• loosen deps and turn off image default features;
• added MultiScale which implements multi scale detection using a classifier;
• now Shaper uses imageproc::rect::Rect as region of interest parameter;
• added reexports for image, nalgebra and imageproc::rect.