Add tasks for all the new languages

Task/HTTP/Sidef/http.sidef

@@ -0,0 +1,13 @@
+func get(url) {
+    var lwp = (
+        try   { require('LWP::UserAgent') }
+        catch { warn "'LWP::UserAgent' is not installed!"; return }
+    );
+    var ua = lwp.new(agent => 'Mozilla/5.0');
+    if (var resp = ua.get(url); resp.is_success) {
+        return resp.decoded_content;
+    };
+    return;
+}
+
+print get("http://rosettacode.org");