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
updated fma function to use std::fma for operation
Merge branch 'develop' of https://github.com/stan-dev/stan into develop
removed std:: namespace from fma for pre-C++-11 compatibility
Merge branch 'develop' into feature/issue-667-fma-calls-fma
removed math::fma function and updated agrad to use ::fma from <cmath>
Merge pull request #1042 from stan-dev/feature/issue-667-fma-calls-fma

Fixes #667. Feature/issue 667 fma calls fma