correct computed property dependency bug

Enyo-DCO-1.1-Signed-off-by: Ryan Duffy (ryan.duffy@lge.com)
add test for shared dependency paths for computed properties

Issue: ENYO-380
Enyo-DCO-1.1-Signed-off-by: Ryan Duffy (ryan.duffy@lge.com)
Merge pull request #907 from enyojs/ENYO-380-ryanjduffy-master

Fixes ENYO-380 (master)

Integrated-By: Aaron Tam (aaron.tam@lge.com)