Implement ImageMapLayer and update karma and grunt config
Update API docs and examples for ImageMapService
Refactor common functionality from DynamicMapLayer and ImageMapLayer into super class RasterLayer
Change documentation references for useCORS -> useCors and update some
API docs
Add first draft of RasterLayer API docs
fix tests
pull from master
Merge pull request #2 from patrickarlt/feature-image-map-layer

Fix tests, pull latest from master
Merge pull request #289 from rdjurasaj-usgs/feature-image-map-layer

ImageMapLayer