Adding pyusb dependency, changing URL.

setup.py

@@ -4,7 +4,7 @@ setuptools.setup(
   version = '1.0',
   packages = setuptools.find_packages(),
 
-  install_requires = ['pyserial>=2.4', 'pyyaml>=3.05'],
+  install_requires = ['pyserial>=2.4', 'pyusb>=1.0.0', 'pyyaml>=3.05'],
 
   author = 'Matt Sparks',
   author_email = 'ms@quadpoint.org',
@@ -12,6 +12,6 @@ setuptools.setup(
   long_description = ('Implementation of the Alpha Sign Communications '
                       'Protocol, which is used by many commercial LED signs, '
                       'including the Betabrite.'),
-  url = 'http://quadpoint.org/projects/alphasign',
+  url = 'https://github.com/msparks/alphasign',
   license = 'BSD',
 )