Update jshint to for ecmascript 6 features
Update dataservice to use geojson-is-valid module
Update layer and tests
Refactor test, move mock data out of describe
Refactor config checking into separate class
Update dataService to extend event emitter
Refactor config class in dataservice module
Delete load method, add start method
Reformat geojson mock data
Remove load method test
Add comments to classes
Add data strategies, adjust DataService and tests
Add data strategy mock