use ${project.reporting.outputEncoding} as default value for "outputEncoding" parameter and default to UTF-8
------------------------------------------------------------------------------------------------------------

          Key: JXR-67
          URL: http://jira.codehaus.org/browse/JXR-67
        Project: Maven JXR
      Issue Type: New Feature
      Components: maven2 jxr plugin
       Reporter: Herve Boutemy


see [Reporting Encoding Configuration|http://docs.codehaus.org/display/MAVEN/Reporting+Encoding+Configuration] proposal

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