Fixed RSpec warnings and fixed exist? for Neo4j::Node and Neo4j::Relationship to return false instead of nil
Release 3.0.0.alpha.15
Impl. rel_type on relationship
rel_type for embedded needs to be inside transaction
Release 3.0.0.alpha.16

Impl. rel_type for Neo4j::Relationship
Better error handling for Rake and when user forgot to create a session fixes #76
Use 2.1.2 Neo4j, since old version can't be downloaded any longer
Merge branch 'master' into query

Conflicts:
	spec/shared_examples/label.rb
	spec/shared_examples/node_auto_tx.rb
	spec/shared_examples/node_with_tx.rb
	spec/shared_examples/relationship.rb
	spec/shared_examples/session.rb