Enabled the first pass at overlaing the trails

This is just the first stab; I'll want to cache the references to the polylines
so that I can dynamically turn them on and off according to user config, and
also so that I can support tapping on the polylines to get trail name and URL,
but this is just POC.

Update to the SQLite database since it had been generated with lat/lon swapped
by mistake...
Merge pull request #6 from agricocb/master

Enabled the first pass at overlaing the trails