The QpsClient no longer executes a fixed number of RPCs but runs for a period of time now (see #83).
After some discussion with @ejona86, we also agreed to remove the "server_threads" parameter
and to no longer use a `DirectExecutor` and thus run the QPS Server without any tweaks and
modifications. We believe/hope that this change will make the comparison between the C++ and
Java versions less "Apples and Oranges".
The "client_threads" parameter was renamed to "concurrent_calls" to better reflect what it
acutally does.
Furthermore, I updated the gradle build script to create separate executables for the
client and the server.
I also added a README.
Jakob Buchgraber
Louis Ryan
Eric Anderson