added return-unit to Point.GreatCircleDistance
Merge pull request #20 from grindhold/develop

added return-unit to Point.GreatCircleDistance
Introduce OpenCage Geocoder
Fix typo in mapquest_geocoder
ROADMAP: clarifying some language
README: whitespace
Merge pull request #22 from johannesboyne/opencage-geocoder

Opencage geocoder
Adding a note of the changes to the changelog
Merge branch 'develop'