Add some basic testing using jasmine

Summary:
Make some tests that test the parser. So far, there are no DOM tests,
but maybe later.

Test Plan:
Run `make serve` and then visit `/test/test.html`. Make sure all the
tests pass.

Reviewers: alpert

Reviewed By: alpert

Differential Revision: http://phabricator.khanacademy.org/D2987

server.js

@@ -25,7 +25,24 @@ app.get("/katex.js", function(req, res, next) {
     });
 });
 
+app.get("/test/katex-tests.js", function(req, res, next) {
+    var b = browserify();
+    b.add("./test/katex-tests");
+    b.transform(jisonify);
+
+    var stream = b.bundle({});
+
+    var body = "";
+    stream.on("data", function(s) { body += s; });
+    stream.on("error", function(e) { next(e); });
+    stream.on("end", function() {
+        res.setHeader("Content-Type", "text/javascript");
+        res.send(body);
+    });
+});
+
 app.use(express.static(path.join(__dirname, "static")));
+app.use("/test", express.static(path.join(__dirname, "test")));
 
 app.use(function(err, req, res, next) {
     console.error(err.stack);