Syntactic sugar for matching all HTTP methods

This release adds matchers for the HTTP Verbs patch, head, options, link, unlink and trace. Previously, only get, post, put and delete were supported, and in order to match other methods you had to query the req object.

Prior to this release, this is how you could match an OPTIONS request:

on req.options? do
  ...
end

And now you can use the options matcher:

on options do
   ...
end

Functionally equivalent, but easier on the eyes :-)

Thanks to @firoxer for the idea and the changeset.