Add admin UI.
Admin UI follow up.
Add request and account to multiple entity views.
Refresh tokens and expirable access tokens.
Make the expiration time configurable for token auth.
Issue #265: Admin UI for the access token module.
Merge pull request #268 from nader77/multiple_entity_view

Add request and account to multiple entity views.
Issue #259: empty <> !isset :horse:
Merge pull request #270 from mateu-aguilo-bosch/259-api-version-missing-0

Issue #259: Fix incorrect version number.
Issue #52: Add missing documentation for errors.
Added docs about the render cache.
Update README.md