updating makefile to include tests
adding clean target to makefile
adding clean target to makefile
test: moved stan's src/test/CmdStan/command_test.cpp to src/test/interface/command_test.cpp
test: moved stan's src/test/CmdStan/fixed_param_test.cpp to src/test/interface/fixed_param_test.cpp
test: moved stan's src/test/CmdStan/optmization_output_test.cpp to src/test/interface/optimization_output_test.cpp
test: moved stan's src/test/CmdStan/print_test.cpp to src/test/interface/print_test.cpp
test: moved stan's src/test/CmdStan/gm/argument_configuration_test.cpp to src/test/interface/gm/argument_configuration_test.cpp
test: moved stan's src/test/CmdStan/model/* to src/test/modles/*