intertwingly

Another different set of REXML bugs.

Test case.  Before:

OS:    i486-linux
Ruby:  1.8.6
REXML: 3.1.6
XML:   <?xml version='1.0'?><root><a v='x &amp; y'/><b v='x &amp; y'/></root>

After:

OS:    i686-linux
Ruby:  1.9.0
REXML: 3.1.7.2
XML:   <?xml version='1.0'?><root><a v='x & y'/><b v='x &amp; y'/></root>

Sigh.