Fix https://github.com/xml4r/libxml-ruby/issues/13.
Fix https://github.com/xml4r/libxml-ruby/issues/13.

The xmlns structure did not add a context field until this commit:

Revision: 978039bbd89fa2daada209e270524d20c9e3ca7e
Author: Kasimier T. Buchcik
Date: 6/16/2006 1:46:26 PM

V2.6.26 was released June 6, 2006.  So 2.6.27 is the first to have it.

sferik/libxml-ruby,increments/libxml-ruby,xml4r/libxml-ruby,increments/libxml-ruby,xml4r/libxml-ruby,sferik/libxml-ruby,sferik/libxml-ruby,xml4r/libxml-ruby,sferik/libxml-ruby,sferik/libxml-ruby,sferik/libxml-ruby,increments/libxml-ruby