CCFEM has been renamed to MultiMesh in the development branch of the git repository.
There you can also find a couple of demos including a demo for a poisson problem (https://bitbucket.org/fenics-project/dolfin/src/5286a24070377ac36c195ebebc814c5a81e3c296/demo/undocumented/multimesh-poisson/cpp/?at=master).