Added comments explaining events and configuration parameters to
interactions.
modified enableInteraction and disableInteraction in ViewerBase to use
the new interaction classes.
Merge pull request #7 from IDgis/interactions-improvements

Interactions improvements
- Added getServiceLayer call to MapProvider
- Symbol controller looks up service layer and service type
Merge pull request #8 from IDgis/legendsymbols

- Added getServiceLayer call to MapProvider
Disabled requireJS in assets pipeline.
Merge pull request #2 from IDgis/dist-fix

Dist fix