Drop jQuery dependency

[jansav]

jQuery is used very lightly and there for it could be dropped from dependencies. All of jQuery code should be rewritten as plain javascript in order to do this.

• https://github.com/Houston-Inc/ppr.js/blob/master/src/ppr.js
• https://github.com/Houston-Inc/ppr.js/blob/master/src/page/baseprototype.js
• https://github.com/Houston-Inc/ppr.js/blob/master/src/component/baseprototype.js
• https://github.com/Houston-Inc/ppr.js/blob/master/src/component/reloadableprototype.js
• https://github.com/Houston-Inc/ppr.js/blob/master/src/library/utils/window.js
• https://github.com/Houston-Inc/ppr.js/blob/master/src/library/utils/string.js