Finish 1.1.0.1. Implement callback modes for #each_statement and #each_triple.
Remove symlink to w3c-rdf tests
Fix test suite assumed URI base.
Update Travis Ruby versions.
Updates for RSpec 3.0.
Don't check for valid list unless subject is a BNode.

This avoids DEPRECATION warning, and addresses issue #30.
Version 1.1.1.
Release 1.1.1.

* Updates for RDF.rb v1.1.5.