Fix coveralls config, SVG badges
Merge pull request #48 from garborg/coveralls

Fix coveralls config, SVG badges
Fix routing test, improve test coverage

A couple important network / routing code paths exposed by Coveralls
Merge pull request #49 from tedsteiner/test

Fix routing test, improve test coverage
Merge pull request #50 from yeesian/master

functionality for finding nodes within range
Merge pull request #52 from yeesian/drivetime-isochrone

[WIP] Drivetime Catchment Areas