lib/Group.js
function (groupName, tree) {
	this.key = groupName;
	this.resolved = false;
	this.dependants = [];
	this.plugins = {};
	this.result = {};
	this.tree = tree;
}
function (groupName, tree) {
	this.key = groupName;
	this.resolved = false;
	this.dependants = [];
	this.plugins = {};
	this.result = {};
	this.tree = tree;
}
---   GROUP CONSTRUCTOR   ---