Use develop branch of required gems and update travis config.
Fix some RSpec anachronisms and use rbx-2.1.1.
Prep for 1.1 release.
Use rbx-19mode instead of rbx-2.1.1
Remove rbx-19mode from travis ci due to failure to exit properly from rspec.
Support RBX >= 2.1.0..
Fix travis config and update gemspec/Gemfile dependencies.
Allow failures for RBX.
Allow failures for RBX.
Allow failures for RBX.
add raptor_serializer_set_namespace, used for passing prefix definitions down to serializer. Define prefixes as with any other RDF writer using :prefixes option.
This closses issue #12
Finish 1.1.0

Conflicts:
	.travis.yml