Application quits when window closed on OSX

[timwis]

Great idea for an application! I noticed that when the window is closed on OSX, the application quits. As noted in the electron quick start, the expected behaviour is for the application to stay active until the user quits (cmd-q).

It appears you attempted to replicate the behaviour suggested in the quick start on line 14 but it's not quite working. My first guess is that it should be window-all-closed instead of mainWindow-all-closed, but I can't test it right now so just wanted to get the issue posted in the meantime. Happy to work on this if the fix isn't obvious.