Update powerline

Change pre/powerline.sh to refer to the new powerline command name.

Move locale.sh from rc/ to pre/ since the default OS X locale envvars
break python's locale libraries.
Add more patterns to .gitexcludes
Disable broken/removed oh-my-zsh plugins
Update emacs config file

Don't try to install the 'melpa' package as it doesn't exist anymore.

Change how mod-theme is loaded due to its autoloading not working with
load-theme.

Add web-mode.
Update MPV config file

Remove removed 'lua' option, update encoding-profiles.conf from mpv.git.
Update SSH config

Update ProxyCommand to use ssh -W instead of netcat

Disable Compression by default
Update submodules