Bureaucracy review updates and hello world test

* Fleshed out client-side Agent class, made abstract
* Delegate the creation of the bureau director to subclasses of BureauClient
* Moved BureauDirector's BureauReceiver and Subscriber implementations to 
  anonymous classes that delegate to protected methods.
* Use SafeSubscriber
* Added new service method for notiyfing the server when the creation of an
  agent fails so that the registry is not perpetually waiting
* Made BureauCredentials more conformant
* Made BureauRegistry respond properly to client logging off
* Got rid of superfluous uses of safeToString
* Changed Launcher to CommandGenerator and now use ProcessBuilder and 
  copyMergedOutput
* Changed bureau process parameters to server name and port instead of URL


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@5030 542714f4-19e9-0310-aa3c-eee0fc999fb1

tests/build.xml

@@ -179,4 +179,24 @@
       </batchtest>
     </junit>
   </target>
+
+  <target name="bureau-runserver" depends="compile"
+    description="Run the bureau test server.">
+    <java fork="true" classname="com.threerings.bureau.server.TestServer">
+      <classpath refid="classpath"/>
+    </java>
+  </target>
+
+  <!-- NOTE: this target is launched by the bureau-runserver target, modelling the way bureaus  -->
+  <!-- work. As such it is not currently useful on its own -->
+  <target name="bureau-runclient" depends="compile"
+    description="Run the bureau test client.">
+    <java fork="true" classname="com.threerings.bureau.client.TestClient">
+      <classpath refid="classpath"/>
+      <sysproperty key="serverName" value="${serverName}"/>
+      <sysproperty key="serverPort" value="${serverPort}"/>
+      <sysproperty key="token" value="${token}"/>
+      <sysproperty key="bureauId" value="${bureauId}"/>
+    </java>
+  </target>
 </project>