pattern: for mojo parameters which have default values in the POM we need 
standard usage
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         Key: MNG-1936
         URL: http://jira.codehaus.org/browse/MNG-1936
     Project: Maven 2
        Type: Improvement

  Components: Design, Patterns & Best Practices  
    Reporter: Jason van Zyl


For mojo parameters which have default values in the POM but can be overriden 
we should have a standard way of doing this:

    /**
     * Directory containing the generated JAR.
     *
     * @parameter expression="${outputDirectory}" 
default-value="${pom.build.outputDirectory}"
     * @required
     */
    private File outputDirectory;

So there is a short name which can be overriden in a POM configuration or the 
command line (outputDirectory), but if not specified we'll fall back to the 
standard recommended value in the POM. There is some inconsistencies in a lot 
of the plug-ins with respect to this.

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