vendor/emmet.js
function(fn, context) {
			return fn.call(context || global, _.bind(r, this), _, this);
		}
function(fn, context) {
			return fn.call(context || global, _.bind(r, this), _, this);
		}
Helper method that just executes passed function but with all
important arguments like 'require' and '_'
@param {Function} fn
@param {Object} context Execution context