Allow killing test server/client

mvn exec:exec doesn't kill the child process when Maven is killed. Now
we just run ourselves, but have Maven do as much heavy lifting as able.
-------------
Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=81736090
diff --git a/pom.xml b/pom.xml
index 730e478..10e4de9 100644
--- a/pom.xml
+++ b/pom.xml
@@ -290,6 +290,16 @@
           <artifactId>maven-protoc-plugin</artifactId>
           <version>0.3.2</version>
         </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-assembly-plugin</artifactId>
+          <version>2.5.2</version>
+        </plugin>
+        <plugin>
+          <groupId>com.internetitem</groupId>
+          <artifactId>write-properties-file-maven-plugin</artifactId>
+          <version>1.0.1</version>
+        </plugin>
       </plugins>
     </pluginManagement>
 
@@ -362,4 +372,4 @@
       </plugin>
     </plugins>
   </build>
-</project>
\ No newline at end of file
+</project>