Bug 997045 - Cannot focus on input field when doing element.click().
   - Make switchToApp do switchToFrame with focus.
   - Modify the package.json to depends on marionette-js-client 1.1.6.
Merge pull request #25 from RudyLu/Bug997045_switchToAPP_withFocus

 Bug 997045 - Cannot focus on input field when doing element.click().
r=gaye, evanxd.