Used for Webdriver 3 multi-touch gestures
See the Webriver 3 spec https://dvcs.w3.org/hg/webdriver/raw-file/default/webdriver-spec.html
The MultiTouchAction object is a collection of TouchAction objects
(remember that TouchAction objects are in turn, a chain of individual actions)
Add multiple TouchAction objects using the add() method.
Used for Webdriver 3 touch actions
See the Webriver 3 spec https://dvcs.w3.org/hg/webdriver/raw-file/default/webdriver-spec.html
The flow is to chain individual touch actions into an entire gesture.