Make fixes/tweaks to behavior of mct-scroll-x and mct-scroll-y directives after testing them against timeline markup. WTD-920.
Implement parent directive for mct-scroll-x, mct-scroll-y. WTD-920.
Add spec for MCTScroll, which will act as a parent class for mct-scroll-x and mct-scroll-y directives, WTD-920.