introduced new Context class. I've bumped up the next release to v4.7.0 because this is a relatively big mind shift in how the framework works, and it's a big enough API change to warrant a minor update. This is the first step towards enabling context tracing for stellar unit testing

package.json

@@ -1,6 +1,6 @@
 {
   "name": "KineticJS",
-  "version": "4.6.1",
+  "version": "4.7.0",
   "devDependencies": {
     "grunt-contrib-jshint": "~0.5.4",
     "grunt-contrib-nodeunit": "~0.1.2",