add knockout-3.1.0.js in catalog/view/javascript/knockout-3.1.0.js
copy them/ecommerce
add link to knockout-3.1.0.js in header.tpl
Merge branch 'develop' of https://github.com/quangthi90/E-commerce into develop

Conflicts:
	catalog/view/theme/ecommerce/template/common/header.tpl