Support for UUIDs in Tuque.
UUID in constructObject tests
namespaces in constructObject tests
Facilitate datastream copying.

Wrap existing datastream, so a copy is created if someone tries to change
it.
Flesh out comments.
getNextIdentifier test
getNextIdentifier supplying many ids if asked
Throw a more descriptive error about malformed XML.
Add property comparison to datastream copy tests.

... Also, flesh out comments.
Merge pull request #51 from adam-vessey/1.x

Facilitate datastream copying.
Merge pull request #50 from willtp87/1.x

Support for UUIDs in Tuque.
Change the exception text a bit.
Merge pull request #52 from jordandukart/1.x

Throw a more descriptive error about malformed XML.