added makefile to perform minification of scripts.js and plugins.js
added makefile for template.css
reduced desk breakpoint to 85em (1360px)
use em values for breakpoints

Copied the breakpoint values from _defaults.scss and added a function
to find the body font size [1]. This is not perfect because the
desk-wide breakpoint adds font-size: 106% to the body element.

 [1] http://stackoverflow.com/questions/10463518/converting-em-to-px-in-javascript-and-getting-default-font-size