Check for model failure with zero initialization, including tests
Added initialization checks to user-specified initialization, updated tests.
Merge branch 'develop' into feature/robust_zero_init
remove folder rstan
sort_asc and sort_desc: removed unecessary size vector checks and added some unit tests
Fixed rank(v,s) unit test warning of implicit convertion from double to int.
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
Merge pull request #74 from stan-dev/feature/robust_zero_init

Check for model failure with zero initialization, including tests
Merge pull request #86 from randommm/feature/sort

sort and rank improvements
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