EXT : added tifffile.py and tifffile.c into source tree

Source: http://www.lfd.uci.edu/~gohlke/code/tifffile.py

added building code to setup.py to build/install the c
extension
PEP8
API : modified DistrobutionSource

 - improved function names
 - added function to get center of bins
 - broke all existing handlers