Added :id_str attribute to Twitter::Status.
In preparation for the Twitter.com Snowflake release that will start
rolling out new, larger Tweet IDs over the next few weeks, I have added
the ability to access the :id_str attribute on the Twitter::Status class
that is returned from the REST API by Twitter.com.
Roll out begins tomorrow (November 4, 2010), but larger IDs will start
being used 24 days after. See announcement email at:
http://groups.google.com/group/twitter-api-announce/browse_thread/thread/
4fc48d25dec3ed57?hl=en