GF-5044: Add enyo.kind.allowOverride flag to allow re-defining kinds (needed by Ares)

Enyo-DCO-1.1-Signed-Off-By: Kevin Schaaf (kevin.schaaf@lge.com)
GF-5044: Fix bug in getPath where error thrown due to null pointer dereference if path is not defined (should just return null in that case).

Enyo-DCO-1.1-Signed-Off-By: Kevin Schaaf (kevin.schaaf@lge.com)