Fixed a bug in OntologyCache.java

I had forgot to comment building the class hierarchy which was giving
error for some ontologies, I just commented that function.
Merge branch 'development' of https://github.com/InformationIntegrationGroup/Web-Karma into development
refactor to remove warnings from OntologyCache.java
saving progress on top k steiner tree ...
Edit for Literal Nodes
saving progress on implementing top k steiner trees
Merge branch 'development' into new_model_layout

Conflicts:
	karma-web/src/main/webapp/js/cleaning-charts.js