fix bug in rstan 1.3.0, output variables in csv files using col-major
unit tests ouside rstan pkg for stanfit object
add rstan gplv3 license
Merge pull request #1 from stan-dev/feature/fix_csv_row_order

Feature/fix csv row order
Merge pull request #2 from stan-dev/feature/add_license

add rstan gplv3 license
udpate stan submodule to develop branch
rstan throw exception when zero inits do not work
Merge branch 'develop' of https://github.com/stan-dev/rstan into develop
add more files to ignore in rstan/.gitignore
remove STAN_HOME to INSTALL.txt
add fix bug of row-major in csv file to NEWS
Merge branch 'develop' into feature/robust_zero_init