Move all python source into msumastro directory
First draft of a working setup.py
Initial attempt at control what is imported with msumastro
Initial attempt at manifest
Add directories generated by setup.py to .gitignore
Ignore py.test .coverage file
Remove import statements from __init__.py until package is actually organized.
Remove two modules not used anymore
Rearrange source files into subpackages
Remove debugging print statements and unneeded copy
Remove unneeded import
Move tests into appropriate directories of subpackages
Fix import statements to reflect new layout
Add mechanism for finding directory with test data reliably

Once again, thanks astropy! Would never have come up with this on my own.
Rename file containing patch_headers

Closes #78
Set up imports for header_processing subpackage
Remove .gitmodules because we do not have any submodules...
Move scripts to scripts directory and update import statements

Closes #79
Include docs and testing data in source distribution
Set up namespace for msumastro