The ngTouch library provides swipe directivesto capture user swipes, either left or right across the screen.
These events are useful when the user want to swipe to the next photo gallery photo or to a new portion of our
app.
The ngSwipeLeft directive detects when an HTML element is swiped from the right to the left and the
ngSwipeRight directive detects when an HTML element is swiped from the left to the right.
