First pass at code update: compatible with Sunpy 0.4 and other fixes

[aringlis]

I've updated the code and tested it with a set of data files already in my possession. Tests were not exhaustive, but I'm able to run the code from start to finish.

Main changes:

• updated code to reflect SunPy 0.4, particularly changes to the map API
• fixes to coordinate transformations (thanks @ayshih)
• renamed the main files to be more sensible and consistent
• Updated the docstrings and the code comments
• Added saving of some output products (right now, model maps of the detected wavefront, in HPC coordinates).

There's still plenty of cleanup to do. Known bugs off the top of my head:

• persistence map function in aware_utils is broken
• The use_pickle keyword doesn't work - should always be None at the moment

[ayshih]

If you haven't already, can you go through the diff for (unmerged) PR #36 by hand and make sure that all fixes by @hayesla have been captured? Since there are whitespace differences, it's easier to look at the diff with those ignored:

https://github.com/sunpy/eitwave/pull/36/files?w=1

[aringlis]

Will do.