add dayOfYear methods for moment.js

moment/moment-tests.ts

@@ -124,6 +124,8 @@ moment().isoWeek();
 moment().isoWeek(45);
 moment().isoWeeks();
 moment().isoWeeks(45);
+moment().dayOfYear();
+moment().dayOfYear(45);
 
 var getMilliseconds: number = moment().milliseconds();
 var getSeconds: number = moment().seconds();

moment/moment.d.ts

@@ -210,6 +210,8 @@ interface Moment {
     isoWeeks(d: number): Moment;
     weeksInYear(): number;
     isoWeeksInYear(): number;
+    dayOfYear(): number;
+    dayOfYear(d: number): Moment;
 
     from(f: Moment): string;
     from(f: Moment, suffix: boolean): string;