PR 28 introduced failing unit tests

[jjtolton]

#28 introduced two unit tests that can fail depending on how the test runner is invoked.

The tests in question occur:

• https://github.com/cnuernber/libpython-clj/blob/master/test/libpython_clj/require_python_test.clj#L112
• https://github.com/cnuernber/libpython-clj/blob/master/test/libpython_clj/require_python_test.clj#L77

The current-ns might change depending on how the test runner is used.