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/snippets/snippets.snippets

@@ -0,0 +1,9 @@
+# snippets for making snippets :)
+snippet snip
+	snippet ${1:trigger}
+		${2}
+snippet msnip
+	snippet ${1:trigger} ${2:description}
+		${3}
+snippet v
+	{VISUAL}