lock webworkify to 1.0.2 to fix ie8 '.default' usage error

webworkify uses exp.default and the default part throws an error in IE8
added webworkify to dependancies rather than dev dependancies

package.json

@@ -72,7 +72,8 @@
   ],
   "dependencies": {
     "video.js": "^5.0.0",
-    "mux.js": "^2.0.0"
+    "mux.js": "^2.0.0",
+    "webworkify": "1.0.2"
   },
   "devDependencies": {
     "babel": "^5.8.0",
@@ -104,8 +105,6 @@
     "sinon": "^1.0.0",
     "uglify-js": "^2.5.0",
     "videojs-standard": "^4.0.0",
-    "watchify": "^3.6.0",
-    "webworkify": "^1.0.2"
-
+    "watchify": "^3.6.0"
   }
 }