[Enhancement] Added facebook login

[KumbuT]

Added very basic Facebook login that triggers when memberView.init is called. It's a dialog based login so please enable pop-ups.

Code is in at-facebook branch. Only AppID is embedded in JS.

To test the login locally, I have to setup a basic server because facebook apps doesn't recognize or allow file://.... kinda URLs. It had to be through http://localhost/

There are several ways to login but this one was the most straight forward one. The idea is to make people login before they can edit their profiles and setup some permissions through facebook groups to figure out whether they're admin or member.

[ambergkim]

@KumbuT I would love a walkthrough how you made this work the next time we meet. :) Very cool.

[KumbuT]

@amgranad - Sure. It's quite simple once I figured out. It would be great to know what's the pattern you're following. It looks like you're headed towards MVC but from the existing structure it's not quite clear. We should discuss and align on this at our next meet.