Crash on unsupported facets

Original [issue 43](https://code.google.com/p/factplusplus/issues/detail?id=43) created by dtsarkov on 2011-11-18T18:13:00.000Z:

FaCT++, in the versions distributed with Protégé 4.1 and 4.0.2, will crash if it is fed an ontology with an unsupported facet restriction.

An example is the following, in Manchester syntax: (note, this snippet is non standard-compliant)

Class: ex:LuminousThing

EquivalentTo: ex:emitsLight some xsd:boolean[>= true]

FaCT++ should refuse or ignore such facets, it should not crash.

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