Added Showdown 0.3.1 definitions

showdown/showdown-tests.ts

@@ -0,0 +1,20 @@
+/// <reference path="showdown.d.ts" />
+
+// compile: tsc showdown/showdown-tests.ts --noImplicitAny --module commonjs
+// run: node showdown/showdown-tests.js
+
+import Showdown = require('showdown');
+
+var exampleMarkdown = '#hello, markdown',
+    converter = new Showdown.converter(),
+    preloadedExtensions = [ 'github', 'twitter', 'prettify', 'table' ],
+    extensionsConverter = new Showdown.converter({ extensions: preloadedExtensions });
+
+console.log(converter.makeHtml(exampleMarkdown));
+// should log '<h1 id="hellomarkdown">hello, markdown</h1>'
+
+console.log(extensionsConverter.makeHtml(exampleMarkdown));
+// should log '<p><a href="http://twitter.com/search/%23hello">#hello</a>, markdown</p>'
+
+Showdown.forEach(preloadedExtensions, console.log);
+// should log each item in the above array