Add a path-template matcher implementation to emulate Sinatra's splat parameters

[jeko2000]

Sinatra allows matching against splat or wildcard parameters.

Per their docs:

get '/say/*/to/*' do
  # matches /say/hello/to/world
  params['splat'] # => ["hello", "world"]
end

get '/download/*.*' do
  # matches /download/path/to/file.xml
  params['splat'] # => ["path/to/file", "xml"]
end

It may be useful to write a path-template matcher implementation to emulate this behavior.