Added sprintf.

Rotation tooltips updated in realtime with current rotation degree.

res/app/components/stf/sprintf/sprintf-spec.js

@@ -0,0 +1,13 @@
+describe('sprintf', function() {
+
+	beforeEach(module('stf.sprintf'));
+
+	it('should ...', inject(function($filter) {
+
+    var filter = $filter('sprintf');
+
+		expect(filter('input')).toEqual('output');
+
+	}));
+
+});