Merge pull request #242 from gberaudo/port_ol3_3.9.0

Update OpenLayers to v3.9.0 and prepare for release

Author: gberaudo

CHANGES.md

@@ -1,13 +1,14 @@
 # Changelog
 
-## v1.8 -
+## v1.8 - 2015-09-10
 
 * Breaking changes
   * Rename `olcs.core.OlLayerPrimitive` to `olcs.core.VectorLayerCounterpart`
     and stop inheriting from `Cesium.PrimitiveCollection`. The underlying
     primitive collection may be retrieved with the `getRootPrimitive()` method.
 
 * Changes
+  * Port to Cesium 1.13 and OL 3.9.0.
   * Allow blocking Cesium rendering to save resources using
     `olcs.OLCesium#setBlockCesiumRendering(true)`.
   * The `build/generate-info.js` tool now follows symlinks to properly