javancss-maven-plugin blows up, drop it.

Author: Gary Gregory

pom.xml

@@ -321,16 +321,6 @@ CSV files of various types.
           </tagListOptions>
         </configuration>
       </plugin>
-      <!--
-          NOTE: this requires Maven 3.0.x; when used with Maven 2.2.1, the following error is seen:
-          Embedded error: Error rendering Maven report: org.dom4j.DocumentFactory cannot be cast to org.dom4j.DocumentFactory
-       -->
-      <plugin>
-        <groupId>org.codehaus.mojo</groupId>
-        <artifactId>javancss-maven-plugin</artifactId>
-        <version>2.1</version>
-      </plugin>
-
       <!-- We need to add our test data files to rat exclusions -->
       <plugin>
         <groupId>org.apache.rat</groupId>