Finish 3.0.1

Finish 3.0.0

Finish 2.2.1

Finish 2.2.0

Finish 2.1.0

Release 2.0.2

Release 1.99.1.

Finish 2.0.0

Finish 2.0.0.beta1

Release 1.99.0:

* When calling @http.request, use ::URI, not ::RDF::URI. Fixes ruby-rdf#29.
* Add that Repository does not support graph_name in addition to context for RDF.rb 2.0.
* Don't insert incomplete statement in `Repository::insert_statement(s)`.