Add vim-githubcomment plugin

Wow, this is far better for reviews than using the website.
Add vim-eighties to mangle windows to their proper width

This still provides a great overview when you have too many windows open, like
I often do.
fixup! Add vim-githubcomment plugin
Use XDG basedir locations for data files

This works *everywhere* I use this repo, but shouldn't really hard code
locations.
Support git config in XDG_CONFIG_HOME
Move bundle menu item to support neobundle config
Set useful paths for generated data files
Ignore all files in external/
Comment snipmate dependencies in neobundle config
Snippets repository renamed to vim-snippets
Add editorconfig repository

A couple of co-workers have chosen to use this, so we'll see how it goes.
Add moonscript filetype repository
Remove spell cache file
Don't echo bufferline to command bar