Added CMS_STRING_EXPANDER.

For now with basic implementation.
  It will be improved later

Added SEO related attribute in CMS_RESPONSE.
Added improved Contact module.
Added basic SEO module.

modules/contact/site/templates/email_message.tpl

@@ -0,0 +1,10 @@
+<p>
+Thank you for contacting {$sitename/}.<br/>
+We will get back to you promptly about your contact message.
+</p>
+<h2>Your contact information:</h2>  
+<div>
+	<strong>Name<strong>: {$name/} <br/>
+	<strong>Email<strong>: {$email/} <br/>
+	<strong>Message<strong>: {$message/} <br/>
+</div>