code: public void setApiKeyFileLocation(String apiKeyFileLocation) {
          this.clientBuilder.setApiKey(ApiKeys.builder().setFileLocation(apiKeyFileLocation).build());
      }
docs: Calls {@code clientBuilder.setApiKey(ApiKeys.builder().}{@link com.stormpath.sdk.api.ApiKeyBuilder#setFileLocation(String) setFileLocation(apiKeyFileLocation)}{@code .build())}.
  See that JavaDoc for expected syntax/format.
  
  @param apiKeyFileLocation the file, classpath or url location of the API Key {@code .properties} file to load when
  constructing the API Key to use for communicating with the Stormpath REST API.
  @see ClientBuilder#setApiKey(com.stormpath.sdk.api.ApiKey)
  @see com.stormpath.sdk.api.ApiKeyBuilder#setFileLocation(String)
  @since 0.2