Added Geo classes for Location and Mercator
Added Geo.Mercator dependency to Map constructors
Grid now requires a Coordinate at instantiation
Changed namespace to pocketsquares/ps, not yet committed to the name
Made Grid.coord private, now that it's required by constructor
Added point-location conversion methods to Base.Map and its implementations
Housekeeping
Added Map callback for when it's moved
Added a Geo.Projection interface for Geo.Mercator to implement
Implemented the useful parts of Getlatlon.com