Added Twitter Social Graph APIs

Twitter recently created social graph APIs. You can get the friends or followers of a given user. This information was available in other ways previously, but the new social graph APIs are very convenient they return an array of numeric IDs. So if you want to do things like visualizing the social graph of people or use this to suggest friends, etc. now you've got an easier way to do it. Of course a great way to visualize such data is in Flash. So I added these APIs to TwitterScript. When the TwitterEvent returns, its data property will be the array of numeric IDs.