Reorder vundles.vim
Add vim-unimpaired plugin
Clean up vundles.vim

No need for .git extension
Add vim-sensible plugin
Remove vimrc stuff that's already in vim-sensible
Change vim backup & swap settings

- Enable swap files and store in ~/.vim/tmp/swap
- Enable write backup and store in ~/.vim/tmp/backup
- Move undo files to ~/.vim/tmp/undo
Clean up vimrc
Remove unnecessary vimrc settings

- showmode is not needed with vim-airline
- disabling cursor blink is unnecessary (barely notice it)
- setting visualbell is redundant (iTerm uses it instead of
  sounds anyway)
Remove unused settings from yadr-keymap
Make <C-l> toggle hlsearch