The fix consisted of introducing "factory" type virtual
methods which ensure that a reference is held to the
returned object. This is important for implementing
factory methods in Python. Without this, the object
get destroyed before we have a chance to increment the
reference count.
- Include a copy of the unit test framework so we're no longer
depending on incompatible versions for Ruby 1 and 2.
- Avoid duplication of path entries in unit tests