PEP8 fixes to astropy/table
PEP8 fixes in astropy/nddata
PEP8 fixes in astropy/nddata/convolution/tests
PEP8: Fixed a few long lines
Removed unneeded + for line continuation
Fixed failing test
Merge pull request #1134 from astrofrog/pep8-fixes

PEP8 fixes in astropy/table and astropy/nddata