Add Recognition-Timeout as an Input attribute

Update to Rayo protocol to add support for `Recognition-Timeout` MRCP header in support of [Punchblock Pull Request 228 ](https://github.com/adhearsion/punchblock/pull/228).
Other places in the specification [such as the [INPUT element](http://xmpp.org/extensions/xep-0327.html#def-component-input-input), and the [RECORD element](http://xmpp.org/extensions/xep-0327.html#def-component-record-record)) reference milliseconds for timeouts.  I'd suggest we need to be consistent.  Plus, milliseconds is probably more appropriate when dealing with small values of time such as these kinds of timeouts.