Merge branch 'develop' of github.com:stan-dev/stan into develop
Unified sampler output through mcmc_writer, updating output to include more information in samples.csv as well as introducing an explicit diagnostic dump option.  Tested and freshly merged with develop.
Unified sampler output through mcmc_writer, updating output to include more information in samples.csv as well as introducing an explicit diagnostic dump option.  Tested and freshly merged with develop.
Merge pull request #81 from stan-dev/feature/new_mcmc_writer

Feature/new mcmc writer