Unicorn::builder to wrap our Rack::Builder usage

This should make it easier to reuse code in derivative
servers like Rainbows! and Zbatery.  Unfortunately, we
can't depend on Rack::Builder/Rack::Server yet since
Rack 1.1 just got them and notable frameworks (like
Rails 2.3.x) do not fully work with Rack 1.1 yet).

This also fixes subtle issue with config.ru files that could
have variables that conflict with the Unicorn-specific
namespace (this bug still affects "unicorn_rails", which
could use some reworking as well).

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