NMS-5182: Import jasperreports-maven-plugin code from http://svn.codehaus.org/mojo/trunk/mojo/jasperreports-maven-plugin/
NMS-5182: Update version to match version currently used by OpenNMS.
NMS-5182: Ben changed the plugin a few years back. Apply those changes.
NMS-5182: Update version to SNAPSHOT.
NMS-5182: Set target version to Java 6
Merge pull request #1 from OpenNMS/jira/NMS-5182

NMS-5182: Fix MavenJavacCompiler imcompatibility to JasperReports Library 5.6.1