Merge pull request #594 from dannymet97/doc_change

Consistant section title and typo correction.
PEP8 fix.

Issue only noticed by PEP8 v1.4.6.
Merge pull request #597 from ajdawson/pep8-cartography-fix

Simple PEP8 fix.
Adds Polar Stereo example code
Polar Stereo after Rebase
Polar Stereo after Rebase with improved title and description