Added correct handling of callable objects as default values
Added correct handling of callable objects as default values

SimplyKnownAsG/voluptuous,natlownes/voluptuous,tuukkamustonen/voluptuous,divanovGH/voluptuous,jmwri/voluptuous,alecthomas/voluptuous,alecthomas/voluptuous,artburkart/voluptuous,SimplyKnownAsG/voluptuous,tuukkamustonen/voluptuous