Version bump to 4.0.1

Merge branch 'master' of github.com:getredash/redash

Merge pull request getredash#2369 from getredash/query-refresh

Add: configuration for query refresh intervals.

Mark current version as v4-beta

CirlceCI: Docker build for release branches.

Set sslmode to prefer, otherwise it might fail with clusters that don…

…'t have the new certificate.

Fix getredash#1776: restart was using wrong command on new AMI builds

Bump version.

ADd changelog entry for favicons fix

Fix: handle the case when a scheduled query wasn't run before