delete out-of-date comment
don't artificially restrict the number of concurrent connections as much

With this change and increased `ulimit -n`,
I can serve significantly more than 1000 concurrent connections.
Make HTTP redirects act domain-relative where applicable.

In production, that allows e.g.
  http://www.idupree.com/plan
  https://www.idupree.com/plan
to redirect in a protocol-relative way.

In development, it allows testing intra-site redirects
on localhost without accidentally getting redirected to
production.
Add a script for setting up an OpenResty server
Add IPv6 support.

This works fine on localhost, though DigitalOcean's network's
lack of IPv6 means it won't actually be useful to my users yet.
Once DigitalOcean adds IPv6 support, I'll see about adding an
AAAA DNS record to offer IPv6 to my users.  I voted for IPv6
as my top priority in their recent customer poll; hoping.
Add SSL/TLS + SPDY support.
note a website for testing SPDY support
remove openresty build dir after install to save disk space

Keeping the build dir gave no benefit, so, might as well rm it.
make server-setup.sh a bit more flexible