Add epsilon to camera change check
Add epsilon to camera change check

Due to inertia and computation instabilities, synchronization may be
very long. This change allows faster synchronization.

gberaudo/ol3-cesium,openlayers/ol3-cesium,gberaudo/ol3-cesium,openlayers/ol3-cesium,thhomas/ol3-cesium,openlayers/ol-cesium,thhomas/ol3-cesium,oterral/ol3-cesium,thhomas/ol3-cesium,oterral/ol3-cesium,openlayers/ol-cesium