highlight use-package before typing package name

This follow the same pattern as the highlighting for provide and require
from `lisp-font-lock-keywords-2' in font-lock.el
Improve (describe-personal-keybindings) output

Create *Personal Keybindings* by with-output-to-temp-buffer. It
redirects standard output to the buffer and display it in help mode. So
we can get help mode keybindings such as "q" for free.

Quote the command-desc output so that it is made into a hyperlink.
Merge pull request #48 from aethanyc/improve-output-buffer

Improve (describe-personal-keybindings) output
Merge pull request #47 from npostavs/hilite-redux

highlight use-package before typing package name