Commented-out classifier in components.xml (#35)

It turns out the Maven Source Plugin doesn't like it if the main artifact has the empty string as its classifier.  It will fail printing a warning saying:

>NOT adding sources to artifacts with classifier as Maven only supports one classifier per artifact.  Current artifact [xxxxx] has a [] classifier.

Apparently the classifier needs to be `null`, which means leaving off the `classifier` tag altogether in 'components.xml'.  We comment-out the tag and include a reference to the issue so we know why we did it.