made the module 'regnmf'. 

It will be easier to reuse the code in here if it is contained in a module. So I made a module called "regnmf". Now one can conveniently link regnmf into one's pythonpath without having to copy the directory around. 

Created the rgnmf dir, moved everything in there and added empty __init__.py. 

Update 27/10/2014: Moved examples/ back into main directory since it shouldn't be part of the module. Moreover, moving examples/ broke the nbviewer link. Updated the notebooks to reflect the change.