TextMatePackage is only designed to load resources out of a TextMate
bundle. It's used only at load time, and from that point out we only
refer to our own global `syntax` data structure to access the data that
it loads.
This simplifies the loading of TextMate bundles in the spec and benchmark helpers. Since `loadBundle` was already implemented on `atom`, it made sense to move this logic here. Config is now more focused on its core job of handling configuration, not loading bundles.
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.
