Remove dependency copying (#376)

There doesn't seem to be a reason to have this phase. Perhaps there was
one before? All the required dependencies are added to the final JAR by
the `maven-shade-plugin` in the `package` phase anyway. This dependency
copying just seems like a waste of time.

pom.xml

@@ -143,20 +143,6 @@
 
 	<build>
 		<plugins>
-			<plugin>
-				<artifactId>maven-dependency-plugin</artifactId>
-				<executions>
-					<execution>
-						<phase>process-sources</phase>
-						<goals>
-							<goal>copy-dependencies</goal>
-						</goals>
-						<configuration>
-							<outputDirectory>${targetdirectory}</outputDirectory>
-						</configuration>
-					</execution>
-				</executions>
-			</plugin>
 			<plugin>
 				<groupId>org.codehaus.mojo</groupId>
 				<artifactId>appassembler-maven-plugin</artifactId>