Fix initialization of RFs (properly take into account val_ini and case where initial value = 0.)
Merge branch 'fix-physio' of https://github.com/pyhrf/pyhrf into fix-physio
Merge branch 'fix-physio' of https://github.com/pyhrf/pyhrf into fix-physio
Fix prf posterior
Merge pull request #47 from thomas-vincent/fix-physio

fix prf posterior