The window was previously flashing white if atom.show() was called
directly after window.startup()
Wrapping the call in a setTimeout with a zero delay seems to prevent
the white flash and the perceived amount of time to display the contents
appears to be the same.
When we actually want to attach the root view in window-bootstrap.coffee, we call `window.attachRootView(path)` instead of calling `window.startup(path)`. Having `startup` called automatically means we can be sure any code we add there runs in every environment (including benchmark and specs). This is where we do things like setup the global keymap, parse text mate bundles and themes, and establish the window close handler. Any globals other than the root view that we want to be available in all environments should be established here. Right now that's just the keymap, but soon I want to add a global pasteboard.
