pyflakes and pep8 for a test file.
base module now passes pyflakes.
Merge pull request #637 from guyrt/pyflakes-cleanup

Pyflakes cleanup
BF: Make RLM stick to Huber's description.
Merge branch 'master' of https://github.com/statsmodels/statsmodels
"Fixed bug in statsmodels/regression/linear_model.py"
" Fixed the 1-d error checking"
Merge pull request #649 from Daniel-B-Smith/master

Bug Fix, input validation sigma
Merge pull request #648 from VirgileFritsch/master

BF: Make RLM stick to Huber's description