Change minimum astropy version to 0.3
Fix modeling for astropy-0.3 compatibility
Change whitespace and line lengths to comply with PEP8
Move long description of package into package docstring

Also made line lengths 80 columns
Merge pull request #13 from mwcraig/fixes-for-v3

Make 0.3 minimum version of astropy and change modeling calls
Merge pull request #19 from mwcraig/pep8

PEP8 changes, mostly whitespace