message: moves botkit module mocks and adds clearAllMocks call
diff: let botkit;
  -beforeEach(() => {
  jest.mock('../../lib/CoreBot', () => 'corebot');
  jest.mock('../../lib/SlackBot', () => 'slackbot');
  jest.mock('../../lib/Facebook', () => 'facebook');
  @@ -9,6 +8,8 @@ beforeEach(() => {
  jest.mock('../../lib/CiscoSparkbot', () => 'spark');
  jest.mock('../../lib/ConsoleBot', () => 'console');
  +beforeEach(() => {
  + jest.clearAllMocks();
  botkit = require('../../lib/Botkit');
  });
  