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
Added vectorization to multi_normal_log
Vectorization of multi_normal, multi_normal_prec and multi_normal_cholesky + tests
vectorization of multi_student_t_log
Changed "response variable" to "random variable" to be consistent with the Stan
added doc for vectorized multi_normal and added subsection in vectorization chapter to describe how it works
added doc for vectorized multi_normal_prec, multi_normal_cholesky, multi_student_t
Fix some unused variable warnings
Some small improvements to multi_normal and other vectorized multivate
Some other small improvements to multi_normal and other vectorized multivate
Added more tests to basic_estimators/normal_multi.stan
merged changes, mostly to validation return types vs. passed refs
cholesky corr type tested and documented
updated reference manual Jacobians math steps