ANG-8071:  Add grey arrow to deactivated state for Contextual Popup Button

Fixing http://jira2.lgsvl.com/browse/ANG-8071

There is a BeeHive fix for this but it is risky to merge the refactored contextual popup into 2.3.0 branch. https://github.com/enyojs/moonstone/pull/1213
So, apply the same asset but implementing based on 2.3.0 branch status.

DCO-1.1-Signed-Off-By: Kunmyon Choi kunmyon.choi@lge.com
fix JSHint error
fix jshint error
Merge branch 'ANG-8071-kunmyonchoi-rc' of github.com:enyojs/moonstone into ANG-8071-rc-soongil

Conflicts:
	samples/ContextualPopupSample.js
Merge pull request #1285 from enyojs/ANG-8071-kunmyonchoi-rc

ANG-8071:  Add grey arrow to deactivated state for Contextual Popup Button