Added a silent progress monitor
Annotations now adding correctly.

Polyglot was adding annotations using the OWLNamedEntity which
is sensible. However, add-annotation was passing this through
ensure-class which was crashing when polyglot was passing in a
property. So, add-annotation now expects a OWLNamedEntity and no
longer calls ensure-class. However, owlclass-explicit was calling
add-annotation (and several other methods) using the classname rather
than the OWLClass object (even though it has this available to it).
So this has been fixed as well.
Bump to 0.8-SNAPSHOT