write request spec for /gauges
create api controller setup and make gaugesController index action with stubbed logic
implement base geojson
Add coords and marker-color to geojson response
add marker-size and marker-symbol to geojson
Add empty description to geojson
dynamically render guages on map
refactor map.js fetchGauges to pass in callback
Remove comments from request spec
Merge pull request #5 from bwinterling/gauge-geojson-api

Dynamically render gauges on map