removing FITS tools
removing FITS_tools from __init__.py
another namespace change

i think that's it
Merge branch 'np-prefix' into giessel-dev
adding initial register_stack()

adding a function to register a stack of images to an optional target
(defaults to aligning to the first image in a stack).  the images are
presumed to be in x by y by frame order.
more register_stack()
register_stack to register_series

changing output to be a tuple of aligned stack, x shifts and y shifts
Merge pull request #2 from dattalab/giessel-dev

Removing FITS tools and adding register_series()