Allow plugins to pass `settingsView`s (Underscore template string or class)

Also:
* Adds size/placeholder options to text controls
* _Lots_ of various fixes to form helpers
* Converts fields to list (still ugly, but will be better for sortable)
* Still need to improve UX of hitting 'save' after making field changes
Design updates

Mess with colors, small tweaks
Nix unused views
Add an inspect helper

Easy way to spit out data in templates.
Fix removing fields
Add stylus compilation to plugins

Also moves plugin JS before page render and allows for interrupting Coffee-based grunt watch triggers.
Don't attempt to reload unfound plugins
Attach mediator to static class instead of instance