cleaned up code, began cleaning up dynamic_glm.py tests

test_codes/pymc_compare/data_generation.py

test_codes/pymc_compare/dynglm_optimisation_test.py

test_codes/pymc_compare/gibbs_posterior

test_codes/pymc_compare/gibbs_sample.py

test_codes/pymc_compare/pymc_posterior

test_codes/pymc_compare/test_data

test_codes/pymc_compare/truth