added cdf_log to pareto distr
added cdf_log to scaled_inv_chi_square
added cdf_log to student_t distr
added operands_and_partials to cdf for skew_normal distr
added cdf_log to skew_normal distr
added operands_nad_partials to cdf for weibull
added cdf_log to weibull distr
Merge branch 'develop' of https://github.com/stan-dev/stan into develop
added cdf and cdf_log to uniform distr
added cdf_log to bernoulli distr
added function signatures with compiled model tests for all cdf_log functions for univariate continuous distributions

except chi square, gamma, trunc normal
Merge branch 'develop' of https://github.com/stan-dev/stan into develop
added missing using statements
added cdf_log to beta_binomial distr
added cdf_log to binomial distr
added cdf_log to poisson distr
added cdf_log to neg_binomial distr
added function signatures with compile model tests for cdf_log of discrete distr

excep for orderd logistic and hypergeometric
added all cdf_logs to manual
added ccdf_log tests to distribution test_fixture