code: public void setApiKeyReader(Reader apiKeyReader) {
          this.clientBuilder.setApiKey(ApiKeys.builder().setReader(apiKeyReader).build());
      }
docs: Calls {@code clientBuilder.setApiKey(ApiKeys.builder().}{@link com.stormpath.sdk.api.ApiKeyBuilder#setReader(java.io.Reader) setReader(apiKeyReader)}{@code .build())}.
  
  @param apiKeyReader the reader to use to construct a configuration Properties instance.
  @see ClientBuilder#setApiKey(com.stormpath.sdk.api.ApiKey)
  @see com.stormpath.sdk.api.ApiKeyBuilder#setReader(java.io.Reader)
  @since 0.2