Added README to user-accounts

Eliminated dependency on outdated js/util/browser.js, fixed a slight error that was present when no port was provided via the command-line, and created the README.txt.  May need to discuss the single-page app example, as right now it doesn't actually operate like a single-page app (see [issue #9](https://github.com/rjrodger/seneca-examples/issues/9)).