Preparing module for npm publishing.

Added index.js with module.export.
Updated the mainfile in package.json to point and the index.js file.

index.js

@@ -0,0 +1 @@
+module.exports = require('./dist/planetaryjs');

package.json

@@ -2,7 +2,7 @@
   "name": "planetary.js",
   "version": "1.1.1",
   "description": "Awesome interactive globes for the web",
-  "main": "dist/planetaryjs",
+  "main": "index.js",
   "scripts": {
     "build": "rm -r dist/ ; gulp && cp dist/planetaryjs.min.js site/public/js/lib",
     "jshint": "gulp jshint",