Proposed Quality Tip -- URI Usability

A proposed quality tip, "URI Usability", is attached.

<http://students.iiit.net/~deepakr/uri-usability/> differs from the
attachment as follows:
1. It has '<base href="http://www.w3.org/QA/Tips/" />' and related changes
2. It has changes that are being tested

To the QA Team:
1. Kindly add this tip to <http://www.w3.org/QA/Tips/> as a draft.
2. Kindly locate the tip in 'uri-usability/index.en-us.xhtml.utf8'