add snippets; fix the kitchensink demo

demo/kitchen-sink/docs/.gitignore

@@ -1,4 +1,4 @@
-# A sample .gitiignore file.
+# A sample .gitignore file.
 
 .buildlog
 .DS_Store

lib/ace/snippets/gitignore.js

@@ -0,0 +1,7 @@
+define(function(require, exports, module) {
+"use strict";
+
+exports.snippetText = require("../requirejs/text!./gitignore.snippets");
+exports.scope = "gitignore";
+
+});