Intern conversion window scroll

This is not a one to one conversion. The original scrollTo tests were hard to convert to intern. These tests run through all of the document layout scenarios and verify that the target element is scrolled into the viewport.

The target element is considered in view if the top or bottom and the right side of the target are within the viewport.

This pull request replaces https://github.com/bryanforbes/dojo/pull/24
Since the contents of this file aren't a test, the modules required should come from `intern/dojo` rather than `dojo`.