Support Additional Geolocation Libraries

[mgerton]

In addition to the Google Maps API, it would be great to support multiple Geolocation libraries (such as the Bing Maps API).

One potential approach for the implementation would be to break the parsing method out into its own class/module that contains multiple types of parsing methods depending on the API that is being used (passed in via constructor or internally determined).

Since JavaScript doesn't have constructs for interfaces or abstract classes, this seems like a good alternative but other implementations are also welcome.