remove unnecessary version overrides

pom.xml

@@ -254,7 +254,6 @@
 			</plugin>
 			<plugin>
 				<artifactId>maven-clean-plugin</artifactId>
-				<version>2.4.1</version>
 				<configuration>
 					<filesets>
 						<fileset>
@@ -290,7 +289,6 @@
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-antrun-plugin</artifactId>
-				<version>1.4</version>
 				<executions>
 					<execution>
 						<phase>process-resources</phase>
@@ -309,7 +307,6 @@
 			<plugin>
 				<groupId>org.codehaus.mojo</groupId>
 				<artifactId>build-helper-maven-plugin</artifactId>
-				<version>1.5</version>
 				<executions>
 					<execution>
 						<id>add-test-source</id>
@@ -351,7 +348,6 @@
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-compiler-plugin</artifactId>
-				<version>2.1</version>
 				<configuration>
 					<includes>
 						<include>**/*.java</include>
@@ -363,7 +359,6 @@
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-jar-plugin</artifactId>
-				<version>2.2</version>
 				<configuration>
 					<archive>
 				<!--		<manifestEntries>
@@ -381,7 +376,6 @@
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-javadoc-plugin</artifactId>
-				<version>2.5</version>
 				<configuration>
 					<stylesheetfile>${basedir}/src/javadoc/jdstyle.css</stylesheetfile>
 				</configuration>