Rainbows! 0.90.2

This release depends on Unicorn 0.96.1 for an updated
Unicorn::HttpParser to avoid leaking memory.

The HttpParser in Unicorn <= 0.96.0 did not setup the parser
object properly to be freed by the garbage collector.

While this bug did not affect Unicorn itself, Rainbows!
allocates a new Unicorn::HttpParser object for every new client
connection and Unicorn did not properly setup the parser object
to be freed by the Ruby garbage collector.

There are also minor cosmetic cleanups and fixes:

Eric Wong (10):
      http_response: disallow blank, multi-value headers
      Fix "rainbows -h" and "rainbows -v"
      Update docs + tests to reflect Rev 0.3.2 release
      local.mk.sample: bump Rack dependency
      Merge branch 'rack-1.1'
      add Cramp integration tests
      Rakefile: autoload Gem
      t/bin/*: encoding should be the first line after shebang
      gemspec: bump dependency on Unicorn to avoid leak
      Rainbows! 0.90.2