Revert dockerfile base image

Update CHANGELOG.md

Merge pull request djenriquez#75 from djenriquez/fix/login-icon

Update reference to Vault image

Merge pull request djenriquez#65 from djenriquez/fix/standby-sys-health

Add exception for sys/health 429 resp

Merge pull request djenriquez#48 from djenriquez/token_management

Update token management

Merge pull request djenriquez#46 from djenriquez/api-rewrite

API rewrite + 0.6.0 compatibility

Add CHANGELOG