[announce] Post threaded status to Twitter

[aalmiray]

Add an option for defining multiple messages that should be twitted as a threaded status.

Allow explicit list of messages.
Allow a message file, each line would be a separate message. Skip empty/blank lines.

Twitter4J API usage

twitter.updateStatus(
new StatusUpdate("[@aalmiray](https://twitter.com/aalmiray)
 This is how you add threaded tweets")
.inReplyToStatusId(1542497822246703104L));