Much faster table of contents.

Fixes issue with toc jumpiness near bottom of articles.

Change-Id: I06debfb01baad1bf03ed1cf6c9af41f0a835e56e
Fix for web view scroll delay.

Change-Id: I9ee11a6be12547c4cb9c0ecb858e7302203a2242
Much faster table of contents.

Change-Id: I06debfb01baad1bf03ed1cf6c9af41f0a835e56e
Much better handling of TOC show/hide swipe.

Now angle and speed of swipe is tunable. Works better with
html tables which have overflow x scrolling also.

Change-Id: Ia02146954dd89eb7e081012cda2004393af187af