Added sprintf.

Rotation tooltips updated in realtime with current rotation degree.

res/app/components/stf/sprintf/index.js

@@ -0,0 +1,2 @@
+module.exports = angular.module('stf.sprintf', [])
+  .filter('sprintf', require('./sprintf-filter'))

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

@@ -0,0 +1,14 @@
+module.exports = function sprintfFilter() {
+  function parse(str) {
+    var args = [].slice.call(arguments, 1)
+    var i = 0
+
+    return str.replace(/%s/g, function () {
+      return args[i++]
+    })
+  }
+
+  return function (input) {
+    return parse(input, arguments[1], arguments[2], arguments[3], arguments[4], arguments[5])
+  }
+}

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');
+
+	}));
+
+});