How do I move a window to my secondary monitor above the menu bar?
SOLUTION: Move your mouse, while dragging a window, up through the menubar faster. 




Go to System Preferences -> Display. 
Select the Arrangement tab, and arrange the secondary monitor so that it sits on top of your MacBook monitor. 


You should be able to move your application window up to the secondary monitor now.

As mentioned in the comments, if the menu bar is blocking you from moving windows up to your secondary monitor: go to the Arrangement tab and drag the little menubar representation from one screen to the other.  (The solution says drag the window THROUGH the menu bar FASTER i.e. quickly.  This works!!)