bump submodules

* vim/bundle/fugitive d4c615c...4c7e649 (3):
  > Encapsulate restore options for diff
  > Revert "Add foldenable to fugitive_diff_restore"
  > Add foldenable to fugitive_diff_restore

* vim/bundle/syntastic 6f214cb...2e60868 (5):
  > Merge pull request #620 from lafka/erl-nested-dirs
  > New C checker for Secure Programming Lint.
  > clisp: some fixes
  > ruby/rubocop: bugfix
  > Merge pull request #622 from roktas/master

* vim/bundle/ultisnips 2c05449...bc0378d (2):
  > drop InterfaceFlavor. Keep things simple
  > improve QuickStart wording

* vim/bundle/vim-snippets 35db4a6...40479af (2):
  > Merge pull request #195 from MichaelThessel/master
  > Merge pull request #193 from jinzhu/patch-1

* vim/bundle/zencoding-vim 6d07bd9...25aeb9d (2):
  > Add test
  > Unique attribute names. close #119

Signed-off-by: Justin de Vesine <ziz@ziz.org>