FindBugs added (commented) #68
Fix #36 trying to read an ontology from a web page url hangs
Fixed some issues with OWL2Datatype.getPrefixedName().  Added test cases
for this.  Added hamcrest as a dependency.
Added test case for OWL2Datatype short forms
Fix for #139
Resolves #140
Ignored example loading remote ontology. wasteful for a unit test.

Also it breaks my builds when I'm on the train.
ignored IRI performance test, reused timeout in base test
added a flag to tell language limitation from runtime error from handled
warning.
Added a pairwise visitor, changed storage strategy for nary axioms

Also revisited compareTo for OWLObjects to skip type visitor.
The pairwise visitor interface is a functional interface that is applied
to all distinct pairs in a collection of objects.