Switch to the CMake build system for CTiles

The previous Makefile was uncompilable on Ubuntu 12.04 with gcc-4.7
CMake should provide a more generic and cross-platform solution.
Remove local CMake modules search. Already provided with CMake 2.8
Add pinball environment

Tested with the Sarsa-Lambda Fourier agent:

$ python pyrl/agents/sarsa_lambda.py --basis fourier \
--fourier_order 4 --epsilon 0.01 --gamma 1.0 --lambda 0.9 \
--alpha 0.001

The original code is maintained at https://github.com/pierrelux/pypinball