Initial work on hyperlinks.
Added public write_url() method.
Comparison tests for write_url().
Comparison tests for write_url().
Added tests for write_url().
Added tests for XML and URL escaping.
Added hyperlink example.
Added hyperlink example.
Prep for release 0.0.5
Merge pull request #4 from jmcnamara/master

Update for release 0.0.5