add twitter bootstrap tooltips to requests

This replaces the sucky browser implementation of displaying an <a> title attribute for only a few seconds, allowing a tooltip to remain as long as the user hovers over or focuses on it. It looks prettier too.

Note that I had to override some Bootstrap styles to display long requests, and I had to append the tooltip to the body (otherwise it would inherit the width of the anchor. This was way too much work for a tiny UI improvement.