pkg:shelf example

This file is being served by package:shelf_static from the /public directory.

This app uses package:shelf_router to define several code-based handlers:

• /helloworld
• /time
• /sum/<a|[0-9]+>/<b|[0-9]+>

The last handler is defined with regular expressions to handle requests to /sum/1/2 and /sum/35/7, but not /sum/bob/john or /sum/1/2/3.