to avoid accidental install which prevents selective update, remove Sources category on JBT update site

(2012-11-30 19:29:13) maxandersen: nickboldt: how about we remove the source category?
(2012-11-30 19:29:21) nickboldt: sure, if you want
(2012-11-30 19:29:38) nickboldt: but then you're making it harder for people to cherry pick source features they DO want
(2012-11-30 19:29:46) maxandersen: nickboldt: then its only affecting those that truly deliberately update them.