lyra level 3 data downloaded, tests added
 changelog entry added
made changes for travis
Changelog merge conflict removed
PEP8 changes
mapcube functions to get the data out as a 3d numpy array, and to get a list of the headers out.  Useful when working with mapcubes
added an empty line at the end
Changelog conflict removed
made the mapcube iterable.  len(mapcube) now returns the number of maps in a mapcube.
changes to the names of the convenience functions
updated docstrings
updated docstrings
adding placeholder for mapcube test functionality
made sure that the as_array function returns a copy, and not just a view in to the data
added .copy() to the as_array() function to ensure a new copy of the data is returned, and not just a view
removed the __iter__ so that there is only one way to access the maps; that way is mapcube.maps. This makes more sense.
updated HELIO link to the updated registry which is not linked to a particular machine
Merge pull request #1080 from dpshelio/heliofix

HELIO url update
Run automated tab to space indentation fixer.
Fix @dpshelio's comments on doc indentation.