Bump versions on code-studio mocha and mochify

mocha: ^2.3.4 to ^2.4.5
mochify: ^2.15.0 to ^2.17.0

There's an intermediate version of mocha (>2.4.0, <2.4.5) that broke compatability with PhantomJS by its use of a particular color output library, documented here: mantoni/mochify.js#129

Bumping to this version ensures we're past that bug, which is fixed in 2.4.5 (https://github.com/mochajs/mocha/blob/master/CHANGELOG.md#245--2016-01-28)

code-studio/package.json

@@ -53,8 +53,8 @@
     "istanbul": "^0.4.2",
     "jshint": "^2.8.0",
     "mkdirp": "^0.5.1",
-    "mocha": "^2.3.4",
-    "mochify": "^2.15.0",
+    "mocha": "^2.4.5",
+    "mochify": "^2.17.0",
     "mochify-istanbul": "^2.4.1",
     "node-sass": "^3.4.2",
     "phantomjs-prebuilt": "^2.1.3",