Move rspec to development/test groups
Add twitter gem and update gemfile.lock
Can get tweets with #tf from twitter

So for testing I thought it would be difficult to use VCR because with
twitter, you get an oauth token/secret for a user and make reqeusts to
the api on their behalf.  They are passed into the TwitterAPI class, but
I left them blank in the tests and VCR was able to successfully capture
and save a cassette.  So, maybe that particular reqeust just required
the twitter client/secret?
Can get ombedded tweets from the twitter api

This was originally just for a single tweet, but I think it makes more
sense to just get back the entire collection.  Also not sure as to
whether it needs to be tested as a public method.  As far as the
interface, the most important method is the one that returns the oembed
html strings, which is what will go into the database (that's what gets
plugged in dynamically) for twitter activity.
Merge pull request #16 from wfro/twitter

Twitter