Correct comment visibility for parentScroll

The documentation for parentScroll advises that this should not be set by
the developer, so it should probably be protected.
Merge pull request #1224 from andrewnicols/ddscroll-docs

Correct comment visibility for parentScroll
Build DD, no min changes
Merge branch 'live-docs' into dev-master
Build Gesture and Paginator that have bad coverage files.