added stubs for all of the cholesky corr factors, w/o tests
add factor_U and factor_L functions to transform to CPCs
Merge branch 'feature/corr-cholesky-type' of https://github.com/stan-dev/stan into feature/corr-cholesky-type
fix factor_L()
add test of factor_L
intermediate state of Cholesky to allow pull of Ben's code
merged transform.hpp
merged changes, mostly to validation return types vs. passed refs
cholesky corr type tested and documented
updated reference manual Jacobians math steps
make lkj_corr_log not depend on lkj_corr_cholesky_log
hopefully accelerate do_lkj_constant
do not use srand anymore in lkj_corr_test
make lkj_corr_cholesky() work the way it is supposed to
correct explanation of Jeffreys prior
elaborate LKJ transformations
Merge branch 'feature/issue-413-cholesky-corr-type' of https://github.com/stan-dev/stan into feature/issue-413-cholesky-corr-type
finished merge with current develop
Merge branch 'develop' of https://github.com/stan-dev/stan into develop
fixed typo.