fixes #122 - allow downloads to be triggered by more than just GET requests

+/**
+ * Check out sizes of resources loaded on a given web page.
+ *
+ * Usage:
+ *    $ casperjs samples/pageweight.js <url>
+ */
+var casper = require('casper').create();
+var size = 0;
+
+function kb(size) {
+    return Math.round(size / 1024 * 100) / 100;
+}
+
+casper.on('resource.received', function(r) {
+    if (r.stage !== "end") {
+        return;
+    }
+    var rSize;
+    r.headers.forEach(function(h) {
+                console.log(h.name);
+            });
+    if (r.bodySize) {
+        rSize = ~~r.bodySize;
+    } else {
+        try {
+            rSize = ~~r.headers.filter(function(h) {
+                return h.name.toLowerCase() === "content-length";
+            }).pop().value;
+        } catch (e) {
+            // try actual content length
+            if (this.getCurrentUrl() === r.url) {
+                rSize = casper.page.content.length;
+            }
+        }
+    }
+    this.echo(r.url + ': ' + rSize);
+    size += rSize || 0;
+});
+
+casper.on('load.finished', function(status) {
+    this.echo('Total: ' + kb(size) + 'KB').exit();
+});
+
+casper.start(casper.cli.get(0));
+
+casper.run(function() {
+
+});