[vim] Please welcome vim-surround
[vim] Updated .gitignore
[vim] Update plugins

- Removed kana's vim-smartinput-plugin in favour of Tim Pope's
  vim-surround.

- Fixed a few netrw-related settings for some "eye candy".
[vim] Some new syntax files

- Addition of markdown.vim, msmtp.vim and notes.vim
[vim] Viminfo's and jetpacks

- Configured viminfo to stick around in the vim-directory.
- Added Bairui's "stop cycling when you can fly"-keybind for quickly
  switching buffers.