pep8: fix empty line counts

top level: 2, else 1

I also advice to not put "pass" into empty classes, but rather a docstring instead of "pass".

test/onionshare_test.py

@@ -20,12 +20,14 @@ import socket
 from onionshare import OnionShare
 from nose import with_setup
 
+
 def test_choose_port_returns_a_port_number():
     """choose_port() returns a port number"""
     app = OnionShare()
     app.choose_port()
     assert 1024 <= app.port <= 65535
 
+
 def test_choose_port_returns_an_open_port():
     """choose_port() returns an open port"""
     app = OnionShare()