Update polyglot to fix UTF8 stomplets (TORQUE-1086, TORQUE-1134)

The browser_stomp_spec.rb integ wouldn't even run with the latest TB
code, so it was refreshed heavily to get things working again.
Persist sessions across restarts by default (TORQUE-869)

Previously sessions only persisted across a server restart if you were
running a cluster and kept at least one server in the cluster running
while restarting the others. Now sessions will persist across restarts
for single servers as well, whether they're running with the clustered
or regular config.
Use MERGE3 and UNICAST3 protocols in our JGroups config (TORQUE-1092)

We also go ahead and set the TCP transport and protocol to keep
messages under 32k in size so things work reliably on EC2.