by slashrsm: Chase HEAD: Use \Drupal\Core\Render\BareHtmlPageRenderer.
Issue #2389063 by slashrsm: Temporary disable form cache.
Merge pull request #34 from slashrsm/2387747

Chase HEAD: Use \Drupal\Core\Render\BareHtmlPageRenderer
Merge pull request #35 from slashrsm/2389063

Temporary disable form cache