Merge branch 'release/v0.3.0' into develop
Fix rst for combined docs
Add sample explore application
Move explore to examples subfolder
Add example files to .gitignore
Add basic point maps
Remove geography option

Specifying geography/geometry and SRID in a setting doesn't work well.
The schema migration has to pick one, and it picked the geography used
for testing.  Geometry in SRID 4326 (WGS84) is a good option for most
GTFS work, and we can't pick a better local projection and still
support all the world's GTFS feeds.
Expand feedinfo.version (Fixes #12)
Expand route.short_name, fixes #14
Add cached geometry for Shapes
explore: filter objects by feed (fixes #21)
explore: add views for Blocks
Add Trip geometry
Move geometry update to post-save signal
Update Trip w/o Shape on Stop save
Add multilinestring geometry for Routes
Add reverse migrations for geometry population
Update all geometries on feed import
Add new files to manifest
Use GeoAdmin for Route