Install essential plugins

Includes:

* tpope/fugitive - an awesome git wrapper
* christoomey/vim-tmux-navigator - painless navigation between Vim/tmux panes
* tpope/vim-unimpaired - pairs of handy key bindings
* tpope/vim-eunuch - base unix commands
* tpope/vim-repeat - enchanced . command
* tpope/vim-rsi - readline key bindings
* kien/ctrlp.vim - fuzzy file/buffer/etc navigator
* vitalk/ctrlp-funky - fuzzy function/class/etc navigator
* endel/ctrlp-filetype.vim - quick filetype change
* vitalk/vim-onoff - on/off boolean options
* vitalk/vim-simple-todo - easy manage GitHub-like tasks lists
* jiangmiao/auto-pairs - insert or delete brackets, parens, quotes in pair