added raw category model
implemented choice of categories
refined model, migration and seeds
missing file
began admin UI
category views for admin
sort categories by id
added button to add categories; removed category#view button
view for new category
included functional tests for categories
imported ancestry gem, created migration and seeds
refined seeds to handle top level category
route to root category with; use show action
mv category navigation from admin to ontology#new
initial dropdown for category tree
implemented js-tree
add category framework
small fixes
deleted helper
Merge branch 'master' into augmenting119_categories_for_ontologies

Conflicts:
	Gemfile.lock
	app/models/ontology.rb
	config/routes.rb
	db/seeds.rb