Add learning curve
MISC remove accidentally commited file. Whoops!
DOC add learning_curve to what's new and API reference

+ PEP8 fixes

+ Alphabetical ordering fix for classes.rst

+ Example reference
FIX explicit type for offset variable
Handle n_features < n_informative case in make_regression.

Useful if n_informative is not explicitly specified, in which case
n_informative=10.
Regenerate C files