add eclipse:clean goal. Use in unit tests!

git-svn-id: https://svn.apache.org/repos/asf/maven/maven-1/plugins/trunk@115942 13f79535-47bb-0310-9956-ffa450edef68

eclipse/xdocs/changes.xml

@@ -25,6 +25,7 @@
   </properties>
   <body>
     <release version="1.8" date="In CVS">
+      <action dev="epugh" type="add" issue="MPECLIPSE-27" due-to="Kristopher Brown">Add eclipse:clean goal.</action>        
       <action dev="epugh" type="fix" issue="MPECLIPSE-36" due-to="Felipe Leme">Fixed a 'race condition' where JUnit dependency is not added to .classpath.</action>
       <action dev="epugh" type="add">Add maven.gen.src property that points to a directory whose subdirectories are included as separate source directories.</action>    
       <action dev="epugh" type="add" issue="MPECLIPSE-10" due-to="Thierry Lack">Set eclipse.dependency=false to explicity ignore dependencies in classpath generation</action>