Stow: Move Emacs config into emacs folder
Stow: Rename Git global ignore file
Stow: Cleanup rest of config

Remove Linux config, use Mac OSX since it is the most recently updated.
Delete things we no longer use. Keep support for bash, zshell, git,
lein, screen, tmux, and vim.
Stow: Update README to reflect whole repo

Was previously the README just for the Emacs-specific portion.
Stow: Reminder about Stow target directory