deleted some comments
Merge branch 'master' of https://github.com/sophiathl/imagecube
Addding in Sophia's changes.

* 'master' of https://github.com/sophiathl/imagecube:
starting to work on test_imagecube
starting to work on testing
merged changes from laptop
test_imagecube runs, although tests fail
changed imagecube get_pixel_scale to use wcs.get_cdelt
added rounding in test_imagecube
merging
changed imagecube to use get_cd; added more rounding in test_imagecube
added test of get_conversion_factor
added test of get_ref_wcs, fixed problem in get_ref_wcs
sketched out test of full imagecube
added data directory and file
changed from rounding to using assert_allclose()
changed path to data file
starting on full test
temp directory/files working
allow input via either command line or arguments to imagecube.main
calling imagecube.main from test_imagecube