Use autocmd! instead of au and autocmd

Now `<leader>sv` works without any hassle
Avoid double spaces when joining sentences

From Gary Bernhardt
https://github.com/garybernhardt/dotfiles/commit/f0c0ff92209e5aed4fa3ef6faf056eb9944a8f12
Cleanup of the prose file types
No special treatment for a language I don't use
Remove remapping of j and k
Added NPM Packages. Thanks, @bitboxer :heart:

* jshint and jslint for linting my JavaScript
* bower, grunt and yo for frontend heavy apps
* docco for some literate programming :wink: