MOAR concurrency for MOAR COARS!

Rainbows! is an HTTP server for sleepy Rack applications.  It is based on
Unicorn, but designed to handle applications that expect long
request/response times and/or slow clients.

* http://rainbows.rubyforge.org/
* rainbows-talk / rubyforge.org
* git://bogomips.org/rainbows.git

Changes:

Rainbows! now scales to more than 1024 worker processes without
special privileges.  To enable this, Rainbows! now depends on
Unicorn 4.x and thus raindrops[1].

client_max_header_size directive is added to limit per-client
memory usage in headers.

An experimental StreamResponseEpoll concurrency option now
exists to buffer outgoing responses without any thread-safe
dependencies.  Unlike the rest of Rainbows! which works fine
without nginx, this concurrency option is /only/ supported
behind nginx, even more strongly so than Unicorn itself.
non-nginx LAN clients are NOT supported for this.  This relies
on the sleepy_penguin[2] RubyGem (and Linux).

There are some minor bug fixes and cleanups all around.  See
"git log v3.4.0.." for details.

[1] http://raindrops.bogomips.org/
[2] http://bogomips.org/sleepy_penguin/

-- 
Eric Wong