If user was trying to get to a specific page but had to log in, let them

get to that page once they've logged in.

cms/templates/login.html

@@ -77,7 +77,11 @@
       submit_data,
       function(json) {
         if(json.success) {
-          location.href = "${reverse('homepage')}";
+          var next = /next=([^&]*)/g.exec(decodeURIComponent(window.location.search));
+          if (next.length > 1) {
+            location.href = next[1];
+          }
+          else location.href = "${reverse('homepage')}";
         } else if($('#login_error').length == 0) {
           $('#login_form').prepend('<div id="login_error" class="message message-status error">' + json.value + '</span></div>');
           $('#login_error').addClass('is-shown');