Make stubs and PDFs showing in jsTree togglable, off by default.
Drop variable on module uninstallation.
Merge pull request #1 from adam-vessey/7.x-FLVC-59

Drop variable on module uninstallation.
Merge pull request #39 from jordandukart/7.x-FLVC-59

Make stubs and PDFs showing in jsTree togglable, off by default.