Eslint, Latest Ember Support

We're now up to date with the latest Ember-cli and ember versions, including eslint and updated ember-try test scenarios. This also means we are no longer testing against 1.13.

Also, some new features have been merged.

• g-map-infowindow now has an onOpen hook - thanks @bschaufler
• g-map-address-* components no longer error if the component is destroyed before the placesService results resolve - thanks @c-brooks
• g-map-address-marker now uses the placesService results viewport to provide an optimal map viewport for the marker. View port can also be manually added to any marker. - thanks @thoresuenert
• g-map-address-marker now support the onClick and onDrag marker actions - thanks @sebastian-misiewicz
• The google maps api script config now supports the channel param.

And huge thanks to @steveszc for making all this happen!