#14 maybe this helps for integration-tests

Thank you for this wonderful plugin :-)

This pull request maybe can help to set up simple integration-tests for this maven-plugin. I added an profile to the pom.xml and two simple integration tests in 'src/it'. 'article-html' tests processing an article into html. 'book-html' tests processing an book into html. After processing in both cases a validation script checks the existent output.

Thank you
Jörg