add cuckoo miner to postform

contrib/js/cuckoo_miner.js

@@ -0,0 +1,13 @@
+onready(function(){
+	document.getElementById("start_miner").onclick = function() {
+		var worker = new Worker("./static/mineworker.js");
+		worker.onmessage = function(e) {
+		  miner_cb(e.data);
+		  worker.terminate();
+		}
+		worker.postMessage(55.0); // Start the worker.
+	};
+});
+function miner_cb(s) {
+    document.getElementById("miner_result").value = s;
+}