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
ENH: add original quantile_regression
DOC: first example for quantilereg
DOC: sandbox examples quantile regression: move first, add new
STY: add whitespace, fix some undefined objects in unused code (pylint)
REF: some code comments, adjustments in unused code