Fixed: updated unit tests

Updated unit tests to work with HTML5 range slider (superseded jQueryUI slider), fixed grid buttons direction (+ -> more pages per row, - -> less pages per row), new y hash parameter behavior (due to zoom now anchoring vertically to center instead of top).
Fixed: replace improper nested selectors

Using both document.getElementById and jQuery selectors is unnecessary in these instances.
Fixed: various small fixes to tests

Dealing with a messed-up rollback; this shouldn't be a duplicate commit somewhere.
Merge branch 'develop' of https://github.com/ddmal/diva.js into horiz-scrolling

Conflicts:
	source/js/diva.js