Close GH-433: Update contribflow version and add contrib.json.

contrib.json

@@ -0,0 +1,6 @@
+{
+  "developmentBranch": "master",
+  "releaseBranch": "stable",
+  "remote": "origin",
+  "upstream": "zencoder"
+}

package.json

@@ -27,7 +27,7 @@
     "grunt-contrib-clean": "~0.4.0a",
     "grunt-contrib-copy": "~0.3.2",
     "mocha": "~1.8.1",
-    "contribflow": "~0.1.0"
+    "contribflow": "~0.2.0"
   },
   "testling": {
     "browsers": [