Release Name: 0.9.0

Notes:



Changes:
* January 6th, 2009: Fifth public release 0.9.
  * Rack is now managed by the Rack Core Team.
  * Rack::Lint is stricter and follows the HTTP RFCs more closely.
  * Added ConditionalGet middleware.
  * Added ContentLength middleware.
  * Added Deflater middleware.
  * Added Head middleware.
  * Added MethodOverride middleware.
  * Rack::Mime now provides popular MIME-types and their extension.
  * Mongrel Header now streams.
  * Added Thin handler.
  * Official support for swiftiplied Mongrel.
  * Secure cookies.
  * Made HeaderHash case-preserving.
  * Many bugfixes and small improvements.