Fixing src/test/models/speed/logistic/logistic_test.cpp to run after difference in behavior with chain_id
updating model_test_fixture
Add size_type to LDLT_factor.
Merge pull request #42 from syclik/fix_test_models

Fixing make target: test-models.
Merge pull request #48 from mbrubake/master

Fixes issue #46
Merge branch 'master' into mcmc_writer
Update command_test to account for new command line argument