updating make target
adding back the target for Windows models
add minipage to fitem so that function args can have multiple lines
Merge pull request #142 from jrnold/bugfix/manual-fitem-minipage

add minipage to fitem so that function args can have multiple lines
Merge pull request #140 from stan-dev/feature/makefile_issue

updating make targets for models
adding precious to improper.exe
fixing the make target for executables
removing improper model from list of .PRECIOUS
Merge pull request #153 from stan-dev/feature/makefile_fix

Feature/makefile fix
Merge branch 'develop' into feature/arg_refactor
added test for categorical_argument with a subargument; changed implementation of categorical_argument