Update ruby-tweetstream to 1.1.4.

Version 1.1.4
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* Added Client#connect to start streaming inside an EM reactor (pelle)
* Added shutdown_stream to cleanly stop the stream (lud)
* Loosened multi_json dependency for Rails 3.2 compatibiltiy

Version 1.1.3
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* Added on_reconnect callback method

Version 1.1.2
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* Added support for statuses/links
* Client now checks that specified json_parser can be loaded during initialization

Version 1.1.1
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* Fix for 1.8.6 compatibility

Version 1.1.0
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* OAuth authentication
* User Stream support
* Removed swappable JSON backend support for MultiJson
* Added epoll and kqueue EventMachine support
* Added on___interval and on_inited callbacks

(taca)