Adds support for matching globs (`*` and `**`)

Allows the use of globs to create simple wildcard matchers:

    var proximous = require('proximous');
    var proxy = proximous('http://mysite.com');

    proxy.matchGet('/*.html'); // Matches GETs for all `.html` files hosted at the root of the web server (ex: `/home.html`)
    proxy.matchGet('**.html'); // Matches GETs for all `.html` files regardless of directory (ex: `/foo/bar/page.html`)
    proxy.matchGet('/apps/**/index.html'); // Matches GETs for all `index.html` files within subdirectories of `/apps`)

Globs can be used with `matchGet`, `matchPost`, `matchAll`, `excludeGet`, `excludePost`, and `excludeAll`.