Point blog to http://edxonline.tumblr.com/

lms/templates/footer.html

@@ -8,7 +8,7 @@
         <a href="${reverse('root')}" class="logo"></a>
         <a href="${reverse('courses')}">Find Courses</a>
         <a href="${reverse('about_edx')}">About</a>
-        <a href="#">Blog</a>
+        <a href="http://edxonline.tumblr.com/">Blog</a>
         <a href="${reverse('jobs')}">Jobs</a>
         <a href="${reverse('contact')}">Contact</a>
       </section>

lms/templates/navigation.html

@@ -35,7 +35,7 @@
     <ol class="guest">
       <li class="secondary">
         <a href="${reverse('about_edx')}">About</a>
-        <a href="#">Blog</a>
+        <a href="http://edxonline.tumblr.com/">Blog</a>
         <a href="${reverse('jobs')}">Jobs</a>
         <a href="#login-modal" id="login" rel="leanModal">Log In</a>
       </li>