code: public void setApiKeySecretPropertyName(String apiKeySecretPropertyName) {
          this.clientBuilder.setApiKey(ApiKeys.builder().setSecretPropertyName(apiKeySecretPropertyName).build());
      }
docs: Calls {@code clientBuilder.setApiKey(ApiKeys.builder().}{@link com.stormpath.sdk.api.ApiKeyBuilder#setSecretPropertyName(String) setSecretPropertyName(apiKeySecretPropertyName)}{@code .build())}.
  
  @param apiKeySecretPropertyName the name used to query for the API Key Secret from a Properties instance.
  @see ClientBuilder#setApiKey(com.stormpath.sdk.api.ApiKey)
  @see com.stormpath.sdk.api.ApiKeyBuilder#setSecretPropertyName(String)
  @since 0.2