Add scroll_into_view to mobile: find

Fix #566
Example. Scroll to an element with text or name matching 'account'

text = 'account'
       # scroll vertical ListView
args = 'scroll',
       # textContains(text)
       [ [3, text] ],
       # descriptionContains(text)
       [ [7, text] ]

mobile :find, args
Merge pull request #570 from bootstraponline/scroll_into_view

Add scroll_into_view to mobile: find