Revert "Merge pull request #899 from enyojs/ENYO-371-graynorton"

This reverts commit 574f605e327ec98a3037168f40788a19a646c1aa, reversing
changes made to 7fb770879a8349688513a670aa5d93bd768acaa4.

This caused some apparent performance regressions and is being reverted
in favor of an encompassing fix that addresses this and a number of other
issues related to scroller.

Conflicts:
	source/touch/Scroller.js