(GEP-166) Remove project specific Module preferences

This commit removes the "Puppet Forge" page and "Potential Problems"
page along with their parent "Module" page from the project specific
preferences. They were never intended to be present there and adding
them was a mistake. Changing them has no effect since no code will
check their settings.
Merge pull request #27 from puppetlabs/issue-166

(GEP-166) Remove project specific Module preferences