added setRequiredFieldDefaults() to set default settings to display the default error message for required fields.
added setRequiredFieldDefaults() to set default settings to display the default error message for required fields.

For error message display method, use: DooValidator::REQ_MSG_UNDERSCORE_TO_SPACE, DooValidator::REQ_MSG_CAMELCASE_TO_SPACE, DooValidator::REQ_MSG_THIS, DooValidator::REQ_MSG_FIELDNAME

$v = new DooValidator;
$v-> setRequiredFieldDefaults(  DooValidator::REQ_MSG_UNDERSCORE_TO_SPACE, ' field is required' );

error message for field 'first_name' would be 'First name field is required'
rhizalpatrax64bit/doophp,mustafakarali/doophp,mythinking/doophp,mustafakarali/doophp,mythinking/doophp,AbdullahFaqeir/doophp,ccfelix/doophp,ccfelix/doophp,somkidodd/doophp,somkidodd/doophp,AbdullahFaqeir/doophp,AbdullahFaqeir/doophp,mythinking/doophp,mustafakarali/doophp,ccfelix/doophp,rhizalpatrax64bit/doophp,somkidodd/doophp,rhizalpatrax64bit/doophp