remove folder rstan
Merge branch 'develop' of https://github.com/stan-dev/stan into feature/fix-grammar-assoc-expected-op
made precedence of >> and > explicit in grammar rules
Added log1m_exp: math, gradients, tests and doc
Added log_diff_exp: math, gradients, tests and doc
Improvement to ordered_logistic distribution: now it uses log1m_exp(.) instead of log1m(exp(.)).
added include of <string> in ast.hpp
Merge branch 'develop' of https://github.com/stan-dev/stan into feature/fix-grammar-assoc-expected-op
Merge branch 'develop' of github.com:stan-dev/stan into develop
Decrease improper posterior threshold for stepsize to account for floating point precision noise
Merge branch 'develop' of https://github.com/stan-dev/stan into develop
Catch init_stepsize when initializating sampler, add tests
Merge pull request #84 from stan-dev/feature/rm_rstan

remove folder rstan
Merge branch 'develop' of https://github.com/stan-dev/stan into develop
variable declarations with periods now fail to parse with an appropriate error message
Merge pull request #94 from stan-dev/feature/robust_stepsize_init

Feature/robust stepsize init
Merge pull request #88 from stan-dev/feature/fix-grammar-assoc-expected-op

Feature/fix grammar assoc expected op
Merge pull request #99 from stan-dev/feature/issue90-periods

Feature/issue90 periods in variable identifiers caught with warnings
Merge pull request #75 from randommm/feature/log1m

log1m_exp and log_diff_exp