updating stan to feature/issue-405-refactor-command
updating stan
makefile: adjusting targets for linked folders: rstan/inst/include/stanlib and stansrc
makefile: added variables
adding an example stan_fit_test
updating makefile for testing c++ code
testing do_print()
fixing makefile for c++ tests
updated implementation of rstan's do_print() to use stan::common::do_print()
refactor: adding test scaffolding for print_progress
refactor: print_progress() -- changing implementation
refactor: removing rstan::do_print(); replacing with stan::common::do_print()
refactor: consolidated do_print() and print_progress()
updating makefile
Merge branch 'develop' into feature/refactor_stan_command
updating stan
updating stan
adding R_Makevars to ignore list
Merge branch 'develop' into feature/refactor_stan_command
ignore the built rstan.Rcheck