ENYO-369: Use last, non-zero swipe direction when determining swipe completion state.

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>
Merge pull request #109 from enyojs/ENYO-369-aarontam-2.5.1-release

ENYO-369: Use last, non-zero swipe direction when determining swipe completion state.

Reviewed-By: Cole Davis (cole.davis@lge.com)
Integrated-By: Ryan Duffy (ryan.duffy@lge.com)