Provide "trimToSize" methods on MapPointer, Internals, and OWLAxiomIndexImpl.
Do not save copy of NNF on  OWL axioms
Merge pull request #294 from sesuncedu/version4_no_nnf_cache

Do not save copy of NNF on  OWL axioms
Merge pull request #293 from sesuncedu/version4_trimming_to_size

Provide "trimToSize" methods on MapPointer, Internals, and OWLAxiomIndexImpl