temporarily pin flux to 2.0, as 2.1 switches to ES6 and Babel which b…

…reaks our Dispatcher.js which fails to correctly extend the new Flux dispatcher, presumably due to using our noddy extend.js rather than an ES6-compatible one

package.json

@@ -24,7 +24,7 @@
   "dependencies": {
     "classnames": "^2.1.2",
     "filesize": "^3.1.2",
-    "flux": "^2.0.3",
+    "flux": "~2.0.3",
     "matrix-js-sdk": "git://github.com/matrix-org/matrix-js-sdk.git#develop",
     "q": "^1.4.1",
     "react": "^0.13.3",