Significantly simplify commandline invocation

Our previous usage was so complex due to Indri JNI which we don't use after all.

README.md

@@ -21,7 +21,7 @@ Quick instructions for setting up, building and running (focused on Debian Wheez
   * ``for i in opennlp netagger wordnet questionanalysis stanfordparser indices; do wget http://pasky.or.cz/dev/brmson/res-$i.zip; unzip res-$i.zip; done``
   * ``wget https://github.com/downloads/oaqa/helloqa/guten.tar.gz; tar -C data -xf guten.tar.gz``
   * ``mvn verify``
-  * ``mvn exec:exec -Dexec.executable=java -Dexec.args="-Djava.library.path=lib/ -classpath %classpath edu.cmu.lti.oaqa.ecd.driver.ECDDriver phases.blanqa"``
+  * ``mvn -q exec:java -Dexec.arguments="phases.blanqa"``
 
 The performance on the Project Gutenberg corpus is not very good. You can
 try asking questions about a smaller snippet of English text ``data/sample.txt``

pom.xml

@@ -142,6 +142,20 @@
 					</descriptorRefs>
 				</configuration>
 			</plugin>
+			<plugin>
+				<groupId>org.codehaus.mojo</groupId>
+				<artifactId>exec-maven-plugin</artifactId>
+				<executions>
+					<execution>
+						<goals>
+							<goal>java</goal>
+						</goals>
+					</execution>
+				</executions>
+				<configuration>
+					<mainClass>edu.cmu.lti.oaqa.ecd.driver.ECDDriver</mainClass>
+				</configuration>
+			</plugin>
 		</plugins>
 	</build>
 </project>