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 #904 from enyojs/ENYO-380-ryanjduffy

Fixes ENYO-380

Reviewed-By: Art Dahm (art.dahm@lge.com)
Integrated-By: Aaron Tam (aaron.tam@lge.com)