ExtendedPropertyDefinition.isEqualTo method fixed

ExtendedPropertyDefinition.isEqualTo method causes not to update multiple extended properties of an item.
(Caused by the changes at 695d30e83bd93a573aad49567dd44e0ecf7658df)

Tag comparison of extended properties added to fix that problem.
Merge pull request #150 from barisaydinoglu/patch-1

ExtendedPropertyDefinition.isEqualTo() method fixed