Created an option to do a marker instead of a circleMarker.
Refactoring commit 2ada0f636457d7d4840e1691e31a0416d93f75cc.
Changed the inner marker variable name to be more generic.
Update Readme with new option for change the inner marker type.
Merge pull request #70 from gmccrackin/gh-pages

Created an option to do a marker instead of a circleMarker.