Added 'neovim' to the feature list, following discussion on #44
scripts/common.sh: remove a couple bashisms

This allows the scripts to work on systems that don't have /bin/bash as
/bin/sh--such as Debian.
Add table of contents to README.md

I added a table of contents to the readme and replaced the html links with markdown links.  Thought you might find it useful!
Fix space in link
Merge pull request #79 from jdiez17/has_neovim

Added 'neovim' to the feature list, following discussion on #44
Merge pull request #85 from jszakmeister/remove-bashisms

scripts/common.sh: remove a couple bashisms
Add link to mailing list
Changed name of binary (vim -> nvim).

Also updated affected config files and test49.vim
README.md: cosmetic fixes