Update the Core#scroll methods

[jmoody]

Motivation

The previous implementation of the #scroll_to* methods would, but default, try to scroll on every matching UIScrollView subclass. This behavior was unpredictable and expensive (time).

The default to behavior is to scroll the first matching scroll view. This behavior is in line with the original documentation. The documentation has been updated to stress that matching multiple scroll views will have unpredictable behavior.

This changeset also includes an interface to the new scrollToMark operation.

      # Scrolls to a mark in a UIScrollView.
      #
      # Make sure your query matches exactly one UIScrollView.  If multiple
      # scroll views are matched, the results can be unpredictable.
      #
      # @example
      #  scroll_to_mark("settings")
      #  scroll_to_mark("Android", {:animated => false})
      #  scroll_to_mark("Alarm", {:query => "UIScrollView marked:'Settings'"})

Other changes

• improved client side argument checking
• specs for most of the scroll_to* API

JIRA

[jmoody]

Console methods are failing on Jenkins. Will address in a subsequent pull request.