Update to TypeScript 1.4

See http://blogs.msdn.com/b/typescript/archive/2015/01/16/announcing-typescript-1-4.aspx for the goodies

Author: teobugslayer

lib/common

@@ -63,11 +63,11 @@
     "grunt-contrib-copy": "0.5.0",
     "grunt-contrib-watch": "0.5.3",
     "grunt-shell": "0.6.4",
-    "grunt-ts": "1.12.1",
+    "grunt-ts": "2.0.1",
     "mocha": "1.21.4",
     "mocha-fibers": "https://github.com/Icenium/mocha-fibers/tarball/master",
     "should": "4.0.4",
-    "typescript": "1.3"
+    "typescript": "1.4.1"
   },
   "license": "Apache-2.0",
   "engines": {