0a5b4be9e3488e928dc775a52e20938df35d3c6b update readme.md for os x compilation

================================ DYNARE MAKE CHECK MATLAB RESULTS ================================ | TOTAL: 531 | PASS: 524 | FAIL: 4 | XFAIL: 3 | XPASS: 0 | LIST OF FAILED TESTS: | * estimation/fs2000_initialize_from_calib.mod | * estimation/MH_recover/fs2000_recover.mod | * estimation/TaRB/fs2000_tarb.mod | * identification/rbc_ident/rbc_ident_varexo_only.mod

================================ DYNARE MAKE CHECK OCTAVE RESULTS ================================ | TOTAL: 525 | PASS: 515 | FAIL: 7 | XFAIL: 3 | XPASS: 0 | LIST OF FAILED TESTS: | * estimation/fs2000_initialize_from_calib.mod | * estimation/MH_recover/fs2000_recover.mod | * estimation/TaRB/fs2000_tarb.mod | * gsa/cod_ML_morris/cod_ML_morris.mod | * optimizers/fs2000_7.mod | * ../matlab/lyapunov_symm.m#1 | * ../matlab/modules/dseries/src/@dseries/dseries.m#5

A full log can be found at http://www.dynare.org/testsuite/master