Packing SAML Response attribute values in an array when there is more than one xml value within a node

[coder-cooke]

We would like to return the attribute values as an array where there is more than one field in an array.

This is similar to #112 but is not identical. That request is dealing with multiple nodes with the same name, whereas this is one node with multiple values.

[borgand]

I created a pull request #122 that fixes this issue in a backwards compatible manner