Principal Author:

Brian Roark <roark@google.com>

Contributors:

Cyril Allauzen    <allauzen@google.com>
Kyle Gorman       <kbg@google.com>
Vitaly Kuznetsov  <vitaly@cims.nyu.edu>
Michael Riley     <riley@google.com>
Richard Sproat    <rws@cslu.ogi.com>
