New feature for lti module.

Add ability to display LTI module in a new
window. Iframe will be still supported.

Fix python test
Update acceptance tests
Fix in acceptance tests, they are stable now
Fix Acceptance tests.
Adding Jasmine tests for LTI.
Fixing Jasmine tests. Adding the rest of Jasmine tests.

common/lib/xmodule/xmodule/css/lti/lti.scss

@@ -2,29 +2,17 @@ div.lti {
     // align center
     margin: 0 auto;
 
-    h3.error_message {
-        display: block;
-    }
-
     form.ltiLaunchForm {
         display: none;
     }
 
+
     iframe.ltiLaunchFrame {
         width: 100%;
         height: 800px;
-        display: none;
+        display: block;
         border: 0px;
         overflow-x: hidden;
     }
 
-    &.rendered {
-        iframe.ltiLaunchFrame {
-            display: block;
-        }
-
-        h3.error_message {
-            display: none;
-        }
-    }
 }