rstan: add point_estimate_Nesterov
Merge branch 'master' of https://github.com/stan-dev/stan
rm boost_1.52.0/boost/fusion/adaptd/.DS_Store
Merge branch 'master' of https://github.com/stan-dev/stan
Merge branch 'master' of https://github.com/stan-dev/stan
rstan: change upon merging brach hmc_refactor (not finished)