Basic cut implementation

SelectionManager implmentaiton
Rectangular seleciton impl
Utils refacoring
Event manager refactoring
basic cut implmentation

js/selection/BaseSelection.js

@@ -0,0 +1,13 @@
+(function () {
+	var ns = $.namespace("pskl.selection");
+
+	ns.BaseSelection = function () {
+		this.pixels = [];
+	};
+
+	ns.BaseSelection.prototype.getFrameSliceFromSelection = function (frame) {
+		if(this.pixels && this.pixels > 0) {
+
+		}
+	};
+})();