Vim shortcuts for navigating QuickFix

I wish `:lnext` would treat the first item as "next" if you aren't on it yet.
Meantime, these two will cover you.
Add `Buffer` global to JSHint
Put JSHint in Node mode, and not strict
Add `browser` globals to JSHint
Remove unnecessary predefs

These are covered now by the `node` and `browser` options.
Use JQuery with JSHint
Tell JSHint about Underscore.js
Tabularize shortcut for colons

Handy for JSON