Add jshint checking for travis-ci for onyx
Clean up an error found by jshint in ContextualPopup.js - use of wrong value.

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)
Add missing period after jshint in .travis.yml

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)
Reverse fix from jshint-detected error -- should be using innerHeight here

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)
Merge pull request #159 from enyojs/travisci-jshint

Travisci jshint

Reviewed-By: Gray Norton <gray.norton@lge.com>