Update request and xmlbuilder dependencies to current latest versions

Utilize the latest version of the request and xmlbuilder modules.  This fixes the dependency warning from their package.json files.

     npm WARN request@1.9.8 package.json: bugs['web'] should probably be bugs['url']
     npm WARN xmlbuilder@0.1.5 package.json: bugs['web'] should probably be bugs['url']

All tests are passing.