UploaderStrategy still requires api_secret if parameter was already added externally #125

if (requiresSigning(action, options)) {
    String apiKey = ObjectUtils.asString(options.get("api_key"), this.cloudinary().config.apiKey);
    if (apiKey == null)
        throw new IllegalArgumentException("Must supply api_key");
    if (options.containsKey("signature") && options.containsKey("timestamp")) {
        params.put("timestamp", options.get("timestamp"));
        params.put("signature", options.get("signature"));
        params.put("api_key", apiKey);
    } else {
        String apiSecret = ObjectUtils.asString(options.get("api_secret"), this.cloudinary().config.apiSecret);
        if (apiSecret == null)
            throw new IllegalArgumentException("Must supply api_secret");
        params.put("timestamp", Long.valueOf(System.currentTimeMillis() / 1000L).toString());
        params.put("signature", this.cloudinary().apiSignRequest(params, apiSecret));
        params.put("api_key", apiKey);
    }
}