New reporting plugins installed

In order to provide easier ways to find information about what is happening in the project, we have enabled the following Maven Plugins:

changelog:
http://mpango.sourceforge.net/mpango-core/changelog.html
http://mpango.sourceforge.net/mpango-core/dev-activity.html

cobertura:
http://mpango.sourceforge.net/mpango-core/cobertura/index.html

checkstyle:
http://mpango.sourceforge.net/mpango-core/checkstyle.html