Slight improvments.

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1648121 13f79535-47bb-0310-9956-ffa450edef68
[MEJB-63] outputDirectory is treated differently to ear, war plugins
 Now we have a sourceDirectory and a outputDirectory which behave the
 way you expect them to behave.
 The sourceDirectory contains those elements which will be archived
 and the outputDirectory contains the created archives.


git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1648129 13f79535-47bb-0310-9956-ffa450edef68
[MGPG-31] fix typos from previous commit

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1648130 13f79535-47bb-0310-9956-ffa450edef68