Fix for pull request 21

Hi,
as a follow up for #21 I created another pull request.

Can you try it again?

The only caveat I have is the default settings of the PMD Eclipse Plugin within a fresh workspace:
You have to go once to "Windows / Preferences / PMD / Rule Configuration" and enable simply all rules. This setting controls globally, which rules are activated and not. Whenever PMD is invoked, only the activated rules are executed. The goal for this setting is e.g., that you could deactivate here globally a rule, you are currently not interested in. I guess, however, we should enable some rules by default, but this should not prevent a new release of m2e-code-quality, I hope.

I also updated the update-site location for the PMD Eclipse plugin. We recently hit a bandwidth limitation there, so I switched the main location to sourceforge's files section.

Thanks,
Andreas