Deck-chores

~~~~~~~~~~~~~~~~

* *fix*: docker-py returns ``None`` for labels of images that were created with
older Docker versions (:issue:`7`)

~~~~~~~~~~~~~~~~~~~~~~

* *new*: there's now a build for arm architectures
* *new*: an architecture agnostic manifest is pushed to the image registry for
release images

~~~~~~~~~~~~~~~~~~~~~~

* *new:* set log format per :envvar:LOG_FORMAT
* *new:* an options label to set behavioural flags
* *new:* containers can be identified as a service by configurable labels
* *new:* job definitions for further containers of a service are ignored
(default, opt-out can be configured)
* *new:* image labels can also be parsed for job definitions
(default, opt-out can be configured)

~~~~~~~~~~~~~~~~~~~~~~

* First release with full documentation