add a load of plugins
update all plugins
map leader to comma
use just one tmp dir
bindings for git gutter
buffer close
also search gems for tags
open ctrl-p at the top
open tabbar automatically
spell checking
spelling
backspace over lines
exit insert mode quickly
relative line numbers in insert mode
AC command to switch to related file
install syntastic
install vim-surround
group autocmds
remove NumberToggle function
use relative number by default