Rate limit messages by batching them
Reduce lag in batched messages

- if no more messages are sent in the 100ms following an original
message, the original will be sent
Merge pull request #58 from freedomjs/lucyhe-batch_messages_in_social

Rate limit messages by batching them
Merge branch 'master' of github.com:freedomjs/freedom-social-xmpp into efficientsocket