add diagnostic_file option to fun stan as in Stan
fix issue 7

wrong names for array parameters
fix issue 7

wrong names for array parameters
Merge branch 'feature/add_diagnostics_output' of https://github.com/stan-dev/rstan into feature/add_diagnostics_output
deal with new column accept_stat__ in the output
Merge branch 'develop' into feature/add_diagnostics_output
Merge branch 'develop' into feature/add_diagnostics_output
rstan vignette correct some typos
add info about function get_posterior_mean to vignetter
add info about function get_posterior_mean to vignetter
add more cites to vignette
Merge branch 'feature/add_diagnostics_output' of https://github.com/stan-dev/rstan into feature/add_diagnostics_output
fix the issue when iter=warmup
Merge branch 'develop' into feature/add_diagnostics_output

Conflicts:
	rstan/rstan/vignettes/rstan.Rnw
Merge branch 'feature/issue8' into develop