treeview for owl ontologies
prepairing view for switching between display modes for owl
made method for get related ontologies for categories
Tests for getting Ontologies which are related to a category
Merge branch 'augmenting189_search_ontologies_by_category' into develop
configure view for javascript
Class Hierachy of owl ontologies
OWL ontologies now Possible to view the class-tree

if possible to create one there is a class hierarchy
to use this there is a rake task to build the trees
Merge branch 'develop' of github:ontohub/ontohub into develop

Conflicts:
	app/controllers/categories_controller.rb
Merge branch 'augmenting249_display_symbols_as_dag' into develop

Conflicts:
	app/assets/javascripts/categories.js
	app/assets/stylesheets/application.css.sass
	app/assets/stylesheets/ontology.css.sass
	app/models/ontology/entities.rb
	app/views/categories/index.html.haml