[#69362532] foundation for adding EPA sites

- Added sinatra/activerecord
- Added infrastructure for models and tasks for AR models
- Created EpaSite model which will hold list of EPA sites and be
cross-referenced by stats received
[#69362532] work to ingest EPA sites
move rake into prod group
fix gems
whoops - prefer heroku url
[#69362532] monitoring site's daily data points

- added model and rake tasks for downloading and importing daily data
points for sites
- set up associations between sites and data point models
[#69362532] working towards active EPA sites showing on map
[#69362532] AQS sites mapping

… as blue dots side-by-side with eggs
[#69362532] fix typo
[#69362532] fix - show map AFTER data loads
modify .gitignore to ignore sascache sync folders
[#69362532 #69362528] conversion from Google to Leaflet + OSM
[#69362528] add ability to choose to be geolocated and toggle layers
[#69362532] add link to Xively page where all egg details can be found
[#69362532 #69362528] added toggle-able heatmaps

for AQE and AQS
[#69362532] documentation updates
[#69362532 #69362528] show basic information about markers

on map popups for both AQS sites as well as eggs
[#69362528] added popup for AQEs with latest readings
[#69362532 #69362528] map improvements

- added weather layers to map
- added display of AirNow readings (daily so far)
- added display of very latest AQE readings
[#69465494] implement universal Google Analytics