Regression examples
Create regression module, factor out lstsq from examples
Eliminate classes
docstrings
FIX: ols_epochs.
The arg 'regressor_names' was assigned but never used. Instead 'names' is used throughout. Made it consistent to prevent errors.
ENH: addresses API/style-related comments
STY changes

RM unnecessary import
ADD test, STY changes
ENH: remove data simulation from test
ENH: add desc
cleanup regression
improve example + update doc
address discussion
update reference
improve fix example
improve fix example + address discussion
fix save example file
clarify docstring
fix links in what's new
fix indent