Merge pull request #10 from SergeyVasiliev/master

Coordinator. Implement sending progress report each second in separate t...
make qsub tasks recognize priority and validate switches correctly
Merge branch 'master' of github.com:dhh1128/mtm
ui work
work on serializing assignments and tasks; contribute David Beer's exec_hosts code
use pimpl pattern in worker and coord engines to avoid cluttering headers
make msg.cpp functions tolerate multi-frame messages. Refactor pub/sub code in the various engine classes. Start writing better tests of worker_engine
Debug multicast announces