This starts off [#359](https://github.com/singapore/renovate/issues/359) (configurable status checks) but only implements one sub-feature of it: disabling status checks to allow automerge if tests fail or if no tests are present.
No longer supporting preformatted (markdown) changelog input for templates.
BREAKING CHANGE: Preformatted {{changeloge}} no longer supported in PR body template.
Generate changelog using handlebars as in the default templtaes.