Merge pull request #447 from sortega/issue/179_offline_start

Fix port forwarding network configuration
Remove scala library version warnings
Remove unused imports in CoinffeinePeerActor
Remove java source level warning
Bump scalaxb version to have better generated code
Merge pull request #448 from sortega/warnings

Remove half of the compilation warnings
Add a new project `coinffeine-benchmark` for load testing

It uses Gatling to execute load tests. So far, it includes a load test for
Coinffeine broker.
Fix invalid status representation in UI for exchanges

It was invoking `Exchange.toString` rather than `Exchange.status`, causing the
case classes to be dumped into the operation status field.
Merge pull request #449 from apoloval/task/cf-171

Add a new project `coinffeine-benchmark` for load testing
Merge pull request #450 from apoloval/bug/cf-185

Fix invalid status representation in UI for exchanges