Remove grunt-ts dependency.

Compile code using tsconfig.json files and plain tsc invocations.
Call those using grunt-shell.

tsconfig.json

@@ -7,6 +7,7 @@
         "declaration": false,
         "noImplicitAny": false,
         "noImplicitUseStrict": true,
+        "removeComments": true,
         "experimentalDecorators": true,
         "diagnostics": true,
         "sourceMap": true,
@@ -38,4 +39,4 @@
         "tns-core-modules/references.d.ts",
         "tns-platform-declarations/ios/objc-x86_64/"
     ]
-}
+}