Added support for "bin-ified" vmstats web app source files

runtime/bin/vmstats/server_access.dart

+part of vmstats;
+
+HttpRequest sendRequest(String url, var onSuccess, var onError) {
+  HttpRequest request = new HttpRequest();

[sethladd1, 2013/03/05 15:59:37]

have you seen
http://api.dartlang.org/docs/releases/latest/dart_html/HttpRequest.html#getSt...
?

[Tom Ball, 2013/03/05 18:53:31]

Looks very useful, but I can't find any way to get the HTTP error code on
failure, though; since getString is static, the HttpRequest it uses looks to be
hidden. Any suggestions?

+  request.onReadyStateChange.listen((HttpRequestProgressEvent event) {
+    if (request.readyState != 4) return;
+    if (request.status == 200) {
+      onSuccess(JSON.parse(request.responseText));
+    } else {
+      onError(request.status);
+    }
+  });
+  request.open("GET", url, true);
+  request.setRequestHeader("Content-Type", "text/plain;charset=UTF-8");
+  request.send();
+  return request;
+}
+
+