added metaextract sample scripts

+casper = require("casper").create()
+url = casper.cli.get 0
+metas = []
+
+if not url
+    casper.echo "Usage: casperjs [url]"
+    casper.exit()
+
+casper.start url, ->
+    metas = @evaluate ->
+        metas = []
+        castarray = (arr) -> [].slice.call(arr)
+        for elem in castarray document.querySelectorAll "meta"
+            meta = {}
+            for attr in castarray elem.attributes
+                meta[attr.name] = attr.value
+            metas.push meta
+        metas
+
+casper.run ->
+    require("utils").dump metas
+    this.exit()

+var casper = require("casper").create()
+  , url = casper.cli.get(0)
+  , metas = [];
+
+if (!url) {
+    casper.echo('Usage: casperjs [url]').exit();
+}
+
+casper.start(url, function() {
+    metas = this.evaluate(function() {
+        var metas = [];
+        [].forEach.call(document.querySelectorAll('meta'), function(elem) {
+            var meta = {};
+            [].slice.call(elem.attributes).forEach(function(attr) {
+                meta[attr.name] = attr.value;
+            });
+            metas.push(meta);
+        });
+        return metas;
+    });
+});
+
+casper.run(function() {
+    require("utils").dump(metas);
+    this.exit();
+});