Updated all plugins that are non-forked. Added some new plugins.

Added update_plugins.py which can fetch new plugins from GitHub.

New plugins added: zencoding, vim-indent-object, taglist, nginx.vim

sources_non_forked/vim-snippets/UltiSnips/zsh.snippets

@@ -0,0 +1,11 @@
+snippet #! "shebang" !
+#!/bin/zsh
+
+endsnippet
+
+snippet !env "#!/usr/bin/env (!env)" !
+#!/usr/bin/env zsh
+
+endsnippet
+
+# vim:ft=snippets: