Cleanup OTI map


  - Update basemaps to: Stamen/Stamen Lite, ESRI Topo, ESRI Satellite
  - Update routes color palette
  - Switch overlay order so stops layer draws above routes

![oti-routes-map](https://cloud.githubusercontent.com/assets/1818302/3517193/a76ec7aa-06ea-11e4-8e6b-d867748ce7af.png)