Add Error Handling to YahooJSON.pm

[bpschuck]

The YahooJSON.pm module needs to add error handling for the cookies and crumb URL fetches.

Instead of continuing to the loop of stock symbols the method should populate the hash and return.

Code would look similar to:

if ($reply->code != 200) {
  foreach my $symbol (@stocks) {
    $info{$symbol, "success"} = 0;
    $info{$symbol, "errormsg"} = $errormsg;
  }     
  return wantarray() ? %info : \%info;
}