[Views] Update representations on mutation (#1312)

* [Core] Log errors from topic

Log full error (including stack trace) when catching errors
from the topic service. Aids debugging of #1303 (and should
aid in future debugging of any similar issues.)

* [API] Fix identifier usage in handleMutation

To address console errors observed in the context of #1303

* [Views] Listen to mutation

Listen for mutation instead of watching modified timestamp;
more reliable due to recent API changes. Fixes #1303.

* [Views] Update spec for mct-representation

...to reflect changes for #1303

src/api/objects/LegacyObjectAPIInterceptor.js

@@ -62,7 +62,7 @@ define([
 
             //Don't trigger self
             objectEventEmitter.off('mutation', handleMutation);
-            objectEventEmitter.emit(newStyleObject.key.identifier + ":*", newStyleObject);
+            objectEventEmitter.emit(newStyleObject.identifier.key + ":*", newStyleObject);
             objectEventEmitter.on('mutation', handleMutation);
         }.bind(this);