Switch From Twitterizer to Tweetvini

Target Framework upped to 4.5
SBTwitter Update + More Functionality

* Twitter link parsing fixed (Twitterizer -> Tweetvini)
+ !tweet [message] to tweet from within IRC for social fun
+ !tweet[dat|last|that] to tweet the last line said for social fun
+ Twitter messages addressed to the Bot account will be posted to
channel if hashtag with channel name is present
+ !twitter follow|unfollow to stream tweets from a user to a channel,
for example for fan channels to keep everybody in the loop on the latest
tweets