Added a (initially trivial) test in Creators/Lib.t too.
Sometimes you start something, but you end somewhere else ;)
The test seems a bit slower now (regex, lookahead, etc). But this should
not hurt label creators in daily use.
Advantages: code is even more solid, consolidated in one place and can be
tested on its own.
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl> Signed-off-by: Nick Clemens <nick@bywatersolutions.com>