Updated tags data structure

[dcam0050]

GetMembers method was failing due to a change in how tags are represented from an array of string into an array of {int, string}.

[warmans]

I'm not sure if this is quite right. For creating a member, you an still use a slice of strings. I don't know if you can also use a slice of objects without an IDs or something?

The fix I've been using is here:

#43