champion guide tests & wukong url fix for lolking.net

Trello card - https://trello.com/c/4nlrA1RU/5-add-a-testing-framework-with-some-basic-tests

Updated readme also, in order to be a bit more specific about running tests.

I was hesitant about including selenium-server-standalone-2.41.0.jar because it is 3XMB; I included it anyway to make life easier.