read Extra params

[ikorich]

Hello you have options to set extra params (- (void)setParameters:(NSArray *)parameters),
but you read it only in - (NSString *)_signatureBaseString

you need add in OAMutableURLRequest.m in - (void)prepare that code for correct request

NSArray *parameters = [self parameters];
    for (OARequestParameter *param in parameters) {
        [chunks addObject:[param URLEncodedNameValuePair]];
    }

now work Yahoo, Deliciou, LinkedIn, etc

[ikorich]

https://github.com/iKorich/oauthconsumer/commit/5a410602e8ade0b51587d4a5e2bb613b7a90a444