Merge pull request #14 from martinthomson/sdp_stub

Working on getting it working
Skeleton unit tests
Fixup include path
Convention change.
A little fleshing out, trying to make similar to existing sdp test
fixture.
More fleshing out of unit test code.
Small compile fixes, and add modelines.
Comment out stuff that doesn't compile yet.
Fixing build some.
Add some stub impl.
Merge pull request #15 from docfaraday/multistream_unit_tests

Multistream unit tests
Fixing errors
Compilation problem