Save `version_special` in `LibraryVersion`
Show `version_special` if no `version` on project page
Delete useless comment

It was messing with my style checker by having long line. :-)
Add test GitHub user to settings

Anonymous users are heavily request-limited. Please, if you see this,
don't mess with our user.
Grammar Nazi in docs
Minor refactoring

There was a weird (IMO) if x/if !x.
Add dump ProjectAdmin
Properly calculate library users count

Prevent cheating with single repo, for example. Anyway the counts are
just a denormalization of otherwise stored data.