A few fixes and updates

*   Polymer and Platform updated to they lastest version (0.3.4)
*   devDependencies updated to they lastest version (grunt, grunt-cli, grunt-contrib-connect)
*   Fixed bower_components folder so you can now update Polymer and Platform just with _bower update_
*   Better tags on example/demo page :-)

Thanks!
FYI, you didn't mean to change the permission of this file and others.