Add dunstrc and ssh config

Add dmenu settings in Xresources.
Add Cypher Vim plugin.
Remove Neobundle as submodule (for Vim-Plug).
Switch plugin manager from NeoBundle to Vim-Plug

Vim-Plug offers faster lazy loading and allows plugins to be loaded when
a certain command is called.
If Vim-Plug is not present it is automatically downloaded.
Allowed option for Makefile to set up appropriate NeoVim links.
Compress all vim files into vimrc

Manageability is maintained through folding; it will be far harder to
browse it on GitHub but easier to edit in Vim.