Adding main field

Adding a `main` field so that npm knows what file to include when the package is `require`d.

Author: thirdender

package.json

@@ -4,6 +4,7 @@
   "email": "[email protected]",
   "author": "Objective HTML, LLC <[email protected]>",
   "license": "MIT",
+  "main": "compiled/flipclock.js",
   "devDependencies": {
     "grunt": "~0.4.2",
     "grunt-contrib-concat": "~0.3.0",