roles/test_conceptql: load vocabulary into a schema

The vocabulary files were loaded into the public schema when they
should have been loaded into the vocabulary schema
02_playbook.yml: clone conceptql to /vagrant

This will let people hack on ConceptQL and test the changes using
test_conceptql immediately
roles/test_conceptql: use local conceptql

Updates test_conceptql's Gemfile so that it uses the conceptql folder
that was just cloned to /vagrant.  That way users can modify conceptql
and immediately test those changes using test_conceptql
CHANGELOG: update