remove tsc from command line

Author: mishab

webdriver-ts/package.json

@@ -7,7 +7,7 @@
     "test": "echo \"Error: no test specified\" && exit 1",
     "postinstall": "typings install && tsc",
     "compile": "tsc",
-    "build-prod": "npm install && tsc",
+    "build-prod": "npm install",
     "selenium": "node dist/benchmarkRunner.js",
     "results": "node dist/createResultTable.js"
   },