Created interface for editing the logo.

All gui development should follow this paradigm of not breaking
encapsulation. Create methods on objects that the parent can call.
And on parents listen for objects from children. Don't crack the
black box. We want to avoid this.$.object.$.object instead
build an interface so you have something cleaner. i.e
this.$.object.getObject().

Follow Enyo law: Send events up and call functions down.
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