Log Message:
Update www/thin to version 0.8.1.  Changes from version 0.8.0 include:

  * [bug] Rescue all types of errors when processing request
  * [bug] Use Swiftiply backend when -y option is specified
  * Allow passing port as a string in Server.new
  * Define deferred?(env) in your Rack application to set if a request
    is handled in a thread (return true) or not (return false).