Removes chevrons for rainbow parentheses

it breaks html syntax highlighting
Adds ag.vim
Removes Powerline in favior of vim-airline
Binds the zoom function if tmux to F11
Updates prezto dep
Disables cursorline + clojure plugin
Disables cursorline and matching parentheses
Uses a new html5 highlighter
Updates to lighter VCS gutter indicator
Updates zprezto