Twitter addon suggestion: #45

So while the current twitter addon displays the latest tweet when it's sent out, why not have it so that if you do $twitter user it would fetch their latest tweet manually or have something like $twitter user 2 and it would fetch their second latest tweet and display it.

Examples

$twitter SomeRandomPerson
Output: [ Twitter ] @SomeRandomPerson: Hi Guys I'm some random person on twitter and this is my second tweet ever! :D

$twitter SomeRandomPerson 2
Output: [ Twitter ] @SomeRandomPerson: Hi Guys This is my first tweet ever!