Merge pull request #3214 from jbblanchet/master

Add when signature for Promise<void>

q/Q-tests.ts

@@ -94,6 +94,7 @@ Q.fbind((dateString?: string) => new Date(dateString), "11/11/1991")().then(d =>
 
 Q.when(8, num => num + "!");
 Q.when(Q(8), num => num + "!").then(str => str.split(','));
+var voidPromise: Q.Promise<void> = Q.when();
 
 declare function saveToDisk(): Q.Promise<any>;
 declare function saveToCloud(): Q.Promise<any>;

q/Q.d.ts

@@ -188,6 +188,9 @@ declare module Q {
         reason?: any;
     }
 
+    // If no value provided, returned promise will be of void type
+    export function when(): Promise<void>;
+
     // if no fulfill, reject, or progress provided, returned promise will be of same type
     export function when<T>(value: IPromise<T>): Promise<T>;
     export function when<T>(value: T): Promise<T>;