I change the Async to Sync because I think this was the cause of my
configuration did not work. In addiction there are some more features I implemented:

+ In global and project configuration I add a field to add a message dafult
appended at the end of the message.

+ In user configuration I add field to save user's twitter id

+ In case of FAILURE build result I get the last sender (ChangeSet) and append
their twitter id in the beginning of the message.

+ In case of update length is gather than 140 chars I divide into N updates with
the number N in the end.

+ I also changed the getResponseBodyAsString() of the tinyurl to
getResponseBodyAsStream() that is recommended