* Fix server crash when header too large.
* Add --require (-r) option to require a library before executing your
script.
* Rename --rackup short option to -R, warn and load as rackup when file
ends with .ru.
* List supported adapters in command usage.
* Add file adapter to built-in adapter, serve static files in current
directory.
* Allow disabling signal handling in Server with :signals => false
* Make Server.new arguments more flexible, can now specify any of host,
port, app or hash options.
* Add --backend option to specified which backend to use.
* Serve static file only on GET and HEAD requests in Rails adapter.
* Add threaded option to run server in threaded mode; calling the
application in a thread allowing for concurrency in the Rack adapter.
* Guess which adapter to use from directory (chdir option) or use
specified one in 'adapter' option.
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