docker: more UTF-8

linters: make yamllint also use python_version In case of Python 3 projects that also have YAML files this can change save some seconds spent on setting up an extra virtualenv (for Python 2).

docker: worker image doesn't need python 3.5 specifically, any 3.x is fine

linters: 0.16.3 is the latest luacheck version with sane exit codes

linters: make use of ampersand in sed expression

templates: align badges to the right on project page too

adapters: update tests

adapters: make get_commit_url() lead to the commit diff

templates: use strict equals in collapser code

docs: add sample queue config