add check_positive_finite with tests
replace check_positive and check_finite with check_positive_finite
fixed missing using statement
add missing include
added frechet_rng test against quantiles generated in R
removed confusing 'Error in function' from exceptions
Refactor initialization routine assuming context_factory pattern is valid
fix merge conflict
removed .orig file
Merge branch 'develop' into feature/frechet-distr
fixed bug for raise_exception statement with multiple args
updating error message within check_simplex
Merge branch 'develop' of https://github.com/stan-dev/stan into develop
added code and tests to handle multiple args to raise_exception stmt
adding more precision to error message
updating test -- Windows wasn't initializing to 0
updated stan reference
cleanup
unit tests under test/unit/gm/raise_exception, models under test-models/no-main/gm/raise_exception
Merge pull request #816 from stan-dev/feature/issue-815-check_simplex-message

Fixes #815. updating error message within check_simplex