Define a text-mode-hook

This sets the mode name to "txt" and enables flyspell mode.
site-lisp: Add nasm-mode
Disable flymake

I traced to being the cause of problems with emacs hanging on loading
new buffers.
Add an (open-in-vim) command

...and bind to F12.
Take off the stabilisers
site-lisp: Add a JS closure linter