Use Dictionary Key for the diff member path

[tmenezes]

Issue: While comparing two dictionaries, it isn't easy to identify what is the item that contains difference if the item key isn't exposed.

Solution proposal: While using dictionaries, the Key property could be used as MemberPath in order to identify the item like the Property Name does for any complex object.

[tmenezes]

I just realized that we have support for ExpandoObject which is an implementation of IDictionary<string, object>... So, it should be straight forward to bring such functionality for regular generic dictionaries as well

[ValeraT1982]

Make sense. I'll think about it in the next version