Rainbows! 0.90.0 - Thread* fixes and RevFiberSpawn

Rainbows! is an HTTP server for sleepy Rack applications. It is based
Unicorn, but designed to handle applications that expect long
request/response times and/or slow clients. For Rack applications not
heavily bound by slow external network dependencies, consider Unicorn
instead as it simpler and easier to debug.


This release should fix ThreadSpawn green thread blocking issues
under MRI 1.8. Excessive socket closing is avoided when using
Thread* models with Sunshowers (or clients disconnecting
during uploads).

There is a new RevFiberSpawn concurrency model which combines
Rev with the traditional FiberSpawn model.

Zbatery is an HTTP server for Rack applications on systems that either
do not support fork(), or have no memory (nor need) to run the
master/worker model. It is based on Rainbows! (which is based on
Unicorn (which is based on Mongrel)) and inherits parts of each.
Zbatery supports your choice of all the thread/fiber/event/actor-based
concurrency models and Rack middleware that Rainbows! supports (or will
ever support) in a single process.

Zbatery will still exploit certain features of Unix for transparent
upgrades, log reopening, and graceful stops, but does not rely on them
for basic functionality.


This gem release allows compatibility with newer versions of
Rainbows! This also fixes a bug when $stdout is not redirected
to a file.