adding selenium to test requirements

Author: munkm

setup.py

@@ -97,7 +97,7 @@
         ':python_version == "2.7"': ['ipaddress'],
         'test:python_version == "2.7"': ['mock'],
         'test': ['nose', 'coverage', 'requests', 'nose_warnings_filters',
-                 'nbval', 'nose-exclude'],
+                 'nbval', 'nose-exclude', 'selenium'],
         'test:sys_platform == "win32"': ['nose-exclude'],
     },
     entry_points = {