STY: optimize: PEP8 clean up, plus a couple simplifications of variable swapping, in optimize.py
MAINT: optimize: In optimize._optimize_newtoncg, move a call to get the floating point epsilon outside of the loop
DOC: optimize: add an example and a note about the step size to the docstring of check_grad
MAINT: optimize: remove a comment in minpack.py about fixed_point--the same information is in the docstring
MAINT: optimize: update import style and simplify a couple variables swaps in optimize.py
Merge pull request #488 from WarrenWeckesser/optimize-tweaks

MAINT: optimize: A little bit of spring cleaning