Add .jshintrc and .jshintignore files for sampler

Fix source to be jshint clean
add .travis.yml file to run jshint on check-in (later work will look at using phantomjs to validate sampler run)
Update enyo and library submodules to latest versions

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)