Modifications to grunt

* Modified Grunt to now create a combined filefor IE8 and below with
 * Respond.js
 * JQuery olidie
 * Excanvas
 * LocalStorage
 * HTML5Shiv
 * Selectervizr 

* Adjust base layout.hbs to reflect changes and to place vapour.js in body since we are exclusive capturing for IE8 and below

* Modified custom modernizr build to not include HTML5shiv in build