require ontology-united

This gem should allow us to write ontologies
for testing purposes in a small dsl.
adjust spec helper for ontology testing dsl

Add a more generalized helper method to get a version
for a file (needed for ontology-united interaction).

Include the Convenience module for ontology-united
interaction.
add a spec for referenced ontologies

This utilizes the testing ontologies DSL
(provided by the ontology-united).