bug1044

1. Pulled designer/editables into ceci-card-designer to remove attributes after elements are deleted.
2. Changed enteredView to attached in ceci-element-base (as per http://www.polymer-project.org/docs/polymer/polymer.html#lifecyclemethods).
3. CeciElementsSorted event emitted to tell designer/mutant to select the same element again.
Merge pull request #1116 from secretrobotron/bug1044

bug1044