Merge branch 'develop' of https://github.com/stan-dev/stan into develop
Merge branch 'develop' of https://github.com/stan-dev/stan into develop
Merge branch 'develop' of https://github.com/stan-dev/stan into develop
Merge branch 'develop' of https://github.com/stan-dev/stan into develop
Merge branch 'develop' of https://github.com/stan-dev/stan into develop
Merge branch 'develop' of https://github.com/stan-dev/stan into develop
Merge remote-tracking branch 'origin/develop' into feature/update-bugs-examples
vectorize some BUGS example models
bugs example vol3/fire using if else statement instead of if_else
use bernoulli_logit and clean up a bugs example model
correct bugs example model vol1/magnesium

add bounds for mu
BUGS example models using binomial_logit
remove more commented-out lines
bugs example vol1/epil uses poisson_log
bugs example v1/oxford uses poisson_log
bugs example v2/air use binomial_log
bugs example v1/salm uses poisson_log
bugs example v2/alli vectorization
bugs example v2/ice uses poisson+log
bugs example v2/endo vectorization