Add a NSView+Animations category.
Always push a user (nil or not) to StreamListViewController.
Run the login commands on the main thread.
Refactor StreamListViewController.

This makes it more robust, animated, and syncs the log messages to
match those of WindowController.
Forgot to add this with the category commit.
Return a LoadingView and don't animate using a background thread.
Bump to 0.6.

Just because.