With a few enhancements like:
- allow local files in schema importer - Mario Manno
- if nsid is nil, find the type in the xmlns namespace - dedsm
- collect attributes also needs the nil nsid check - dedsm
- Support for relative paths - saulm
- Improvements on resolver and importer - saulm
- Fix error on base_file_path creation - saulm
- Resolve includes on XSD - saulm
- Add Sabre wsdl/xsd - saulm
- fix for Schema imports with N level of nesting. - Andrew Whitmore