Log Message:
Update ruby-amq-protocol to 1.9.2.

## Changes between 1.9.x and 1.10.0

### Signed 16 Bit Integer Decoding

Signed 16 bit integers are now decoded correctly.

Contributed by Benjamin Conlan.

## Changes between 1.8.0 and 1.9.0

### Performance Improvements in AMQ::BitSet

`AMQ::BitSet#next_clear_bit` is now drastically more efficient
(down from 6 minutes for 10,000 iterations to 4 seconds for 65,536 iterations).

Contributed by Doug Rohrer, Dave Anderson, and Jason Voegele from
[Neo](http://www.neo.com).

## Changes between 1.7.0 and 1.8.0

### Body Framing Fix

Messages exactly 128 Kb in size are now framed correctly.

Contributed by Nicolas Viennot.