Create node server to replace 'make watch'

Reviewers: xymostech

Reviewed By: xymostech

Differential Revision: http://phabricator.benalpert.com/D38

static/main.js

@@ -0,0 +1,10 @@
+window.onload = function() {
+    var input = document.getElementById("input");
+    var math = document.getElementById("math");
+
+    MJLite.process(input.value, math);
+
+    input.oninput = function() {
+        MJLite.process(input.value, math);
+    };
+};