Clean up repo some.

- Add gemdandyrc
- Add gs alias to gitconfig.erb
- Refactor README extension to md
- Add ssh/config
- Rename zshrc to zshrc-osx
Move some Vim powerline configs around.
Start using tmux powerline.
Fix _tmux-zoom-current-pane script.
Add pretty log aliases to git config.
Update Medic-CE server configuration in SSH config.
Update Buffer Gator setting in vimrc.
Add .git-scripts to path.  Remove unnecessary line from zshrc-osx.
Add tree alias for git-forest command.
Add atomic-fads to gemdandyrc.
Add pass control staging to ssh config.
Update tmux-ide-ruby
Add JAVA_HOME env variable and add to PATH.