Merge pull request #189 from adityab/memberops

Op-ify Member Data
* Fix faulty range comparison logic for
DomUtils.rangeIntersectsNode by using
DomUtils.rangesIntersect.
* Similarly clean up DomUtils.rangeContainsNode
using DomUtils.containsRange.

* Added various tests for range intersection.

This fixes issue #200 because now OpApplyDirectStyling
knows for which paragraphs it should fire
signalParagraphChanged.