Registration checklist

[anowacki]

These are a list of things that will need to be done to register the package:

• Add an API to allow the user to choose the computation algorithm. Default to Karney (GeographicLib). Include Vincenty as an option. (Maybe add Haversine for when using a sphere?)
• Copy in the code (functionality and tests) of GeographicLib.jl to provide the default algorithm, but don't expose the interface.
• OR: Register GeographicLib.jl as is, and depend on that.
• Change the name (Register package? #3)
• Bump the minor version