removed polymer import, changed default size, fixed bower.json

I removed the Polymer import in the `index.html` file because it
should not be there anyway, users should import in their own
`index.html`, changed the demo size to `1000x500` because it works
better when testing, and added the `main.js` to `bower.json`
Merge pull request #3 from rcsole/random-fix

removed polymer import, changed default size, fixed bower.json