Release 1.1.2.

* Use updated ref_count logic from rdf-rdfa.
* Override rdf-rdfa preprocessing for RDF/XML semantics in managing prefixes.
Improve REXMLX support and use different Gemfiles for pure vs. compiled (REXML vs Nokogiri).
WITH_NOKOGIRI environment variable now seemingly ignored when doing `bundle install`.
This addresses issue #29.
Version 1.1.3.
Release 1.1.3.

* Fully support REXML-only, including in testing environment.