Use lookup.json instead of show.json (Twitter API)

[AlexGaspar]

Hey,

I rewrite some of the code to use lookup.json instead of show.json this will do only one request to twitter instead of 10 requests if you have 10 accounts. I also rewrite the avatar's part, it was not working for me.

P.S. thanks for sharing your code that was really helpfull ;) Alex