Blueprint example app

[dmishe]

As per #404.

Though i have a couple of issues:

1. I can't mount blueprint's static under "/", would be good to show how static could be inside blueprint too (Static files only work for blueprints registered with url_prefix #348)
2. For some reason, if i register same blueprint under / and /pages/, / works as expected showing me index template, but /pages/ redirects back to /. Is it desired behavior?

[kennethreitz]

I'd love to see this added. Proper use can be a little un-obvious at first glance.

[dmishe]

Yo, any comments? :)

[kennethreitz]

@dmishe 🍰