Using the Meetup & Google Maps APIs to auto-update the next event

These changes utilize the Meetup and Google Maps APIs to auto-update the event posting on the homepage via JavaScript. They also introduce bower as a FE dependency package manager.

Note that this change uses a Meetup API signed URL and therefore requires that the sig_id and sig parameters of the API call cited on line 15 of meetup.js be replaced with values retrieved via the Philly.rb account. More info here: http://www.meetup.com/meetup_api/auth/#keysign

Please let me know if you have any questions or concerns.

Thanks!