Trying to improve the documentation.
Update README.md

Fixing a few typos in the docs.
Added a new keyboard shortcut link.
Added link to the remote pairing section.
Merge pull request #4 from aesterline/documentation

Documentation
Add a slightly customized copy of color-them-twilight to make the region/selection more visible.
Confirm on quit. I have killed emacs with my fat fingers one too many times.