provide cool decorators

[gabrielfalcao]

that fails if a TCP port is busy

from sure import expect

@expect.free_port(8000)
def test_my_server():
    # run the server
    # run assertions against http request/responses

[timofurrer]

@gabrielfalcao We should define a set of cool decorators to implement.
As well as we might want to be leave this as extensions once #31 is fully implemented.
What do you think?