 * Fixed py_builtins.repr(): add support for repr(class), remove support for .toString, make sure "None" is returned as a str()
 * Fixed py_builtins.repr(): add support for repr(class), remove support for .toString, make sure "None" is returned as a str()

chrivers/pyjaco,buchuki/pyjaco,buchuki/pyjaco,buchuki/pyjaco,chrivers/pyjaco,chrivers/pyjaco