Add initial changes to support Toronto data (#45)
* Add initial changes to support Toronto data
Add data for TTC Lines 1 through 4
Update data schema
Dynamically load line icons from data metadata
Fix icons not being loaded after style changes (Fixes #44)
Load icons from SVG instead of fixed-sized PNGs
* Fix data issues
* Added Greenboro platform
* Added missing elevated track segments at Lincoln Fields
* Re-ordered Lines 1 and 3 so 3 is shown above 1
* Added future storage tracks at Algonquin
* Fixed missing overpass at Hunt Club for Line 4
