add tests for client, error-handler, matches, participants, tournaments.  update coverage npm script to get 100% coverage

add client setSubdomain and makeRequest tests.  add https mock for testing.  update test helper loading

fix exception thrown if client created without a option object.  Add deps for tests.  Add tests for challonge.js.  Hook up to travis for running tests.  Add test instructions to readme.  Update gitignore and test configs