Disable the "Go" button when the requested distance is 0
Fixes #23
Limit runs to 2-digit lengths
Fixes #24
Immediately transition to run preview screen and indicate loading.
All route loading is done in the context of the preview screen.
Fixes #20, though perhaps without style.
Use built-in MapView rect with margins method.
Occlude the map when loading a route
Improves fix to #20
Fix case when loading a route when requesting one before we have authorization to location data.
Merge pull request #26 from mojotech/fcanas/run-plan

Improve the run planning process