Force the usage of typescript 1.4.1

Force the usage of typescript 1.4.1 because with higher versions the
generation of commented files failed. Refresh comments.d.ts files.

Author: vbornand

package.json

@@ -44,7 +44,7 @@
     "grunt-text-replace": "^0.3.11",
     "jsdoc": "~3.3.0-alpha10",
     "load-grunt-config": "~0.7.2",
-    "typescript": "^1.4.1",
+    "typescript": "1.4.1",
     "yuidocjs": "^0.3.50"
   }
 }