Add vim-go submodule
Update submodules
Update UltiSnips configuration

- UltiSnips_JumpForwards() -> UltiSnips#JumpForwards()

- Moved snippets to the new default folder.
Use smartindent
Add Go snippets
Use shiftround
Add several wildignore entries
Python and LESS file type fixes

- Restore custom tab settings for Python files. The default now overrides your
  settings for some reason.

- Set filetype to scss for LESS files.  There is no LESS highlighting by default
  and it's close enough to SCSS.
Add \g (GitGutterToggle) and \l (list) mappings

- Move IndentGuidesToggle to \i.