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/snipmate-snippets/javascript-jquery/ajax.snippet

@@ -0,0 +1,18 @@
+$.ajax({
+	url: "${1:mydomain.com/url}",
+	type: "${2:POST}",
+	dataType: "${3:xml/html/script/json}",
+	data: $.param( $("${4:Element or Expression}") ),
+
+	complete: function() {
+		${5://called when complete}
+	},
+
+	success: function() {
+		${6://called when successful}
+	},
+
+	error: function() {
+		${7://called when there is an error}
+	},
+});