reserve the size of values vector of the sampling recorder
updating command.hpp to use std::cout for message stream.
Merge pull request #772 from stan-dev/feature/rstan_issue90

Fixes stan-dev/rstan#90. reserve the size of values vector of the sampling recorder
Merge pull request #775 from stan-dev/feature/cmdstan-issue-21-elapsed-time-printed-twice

fixes stan-dev/cmdstan#21. Fixes CmdStan's printing elapsed time to file twice (and none to std::cout)
Merge branch 'develop' into feature/issue-677-check-function-sigs