creating a new src/stan/math.hpp, moving old to src/stan/math_old.hpp
updating #define for src/stan/math.hpp
updating #include for math_old.hpp
moved include of stan/math/constants.hpp to stan/math.hpp
moving exp2 out of src/stan/math/special_functions.hpp
fixing test/agrad/special_functions_test.cpp
moving fdim out of src/stan/math/special_functions.hpp
moving fma out of src/stan/math/special_functions.hpp
moving fma log2 of src/stan/math/special_functions.hpp
moving int_step out of src/stan/math/special_functions.hpp
moving step out of src/stan/math/special_functions.hpp
moving lbeta and binomial_coefficient_log out of src/stan/math/special_functions.hpp
moving inv_logit out of src/stan/math/special_functions.hpp
moving lbeta and binomial_coefficient_log out of src/stan/math/special_functions.hpp
moving binomial_coefficient_log out of src/stan/math/special_functions.hpp
moving logit out of src/stan/math/special_functions.hpp
moving Phi out of src/stan/math/special_functions.hpp
moving Phi and logit out of src/stan/math/special_functions.hpp
update to logit and Phi
updating special_functions_test.cpp