Hook up all of the preferences.
Make the refresh preference most robust.
Lighter separators.
Hook up the popup preference.
Hook up notification preference.
Hook up the stream item count preference.
Tweak the status icon ever so slighty.
Create an NSWindow subclass.

Since our window is borderless, we have to make it respond to
-becomeKey and -resignKey.
Throw NSWindowDelegate at the WindowController.