Berth

------------------
* Updated to support version 1.24 of the Docker API.
* Updated to work with new version of ``tenzer/fpm``.

------------------
* Somehow the fix in 1.3.2 got lost, so we are adding that back in again.

------------------
* Bumped dependencies on docker-py and click. The former has a bug in < 1.3.1 where the streaming output from a container can suddenly stop while the container keeps running.

------------------
* Fixed packaging problem about missing CHANGELOG.md at installation time.

------------------
* Bumped dependencies on the docker-py and click libraries.
* Replaced ``dockerfiles/fpm`` with ``tenzer/fpm`` as the default image to use for packaging as the dockerfiles image no longer exists.

------------------
* Added ``--build-only`` and ``--package-only`` flags to tell Berth to only do one of the two steps. This can be useful when setting up a configuration for a new package together with:
* New ``--keep-containers`` flag which makes the containers Berth create stay around after the jobs have ran. This will make you able to ``docker run`` them afterwards and inspect the files inside of them.
* Berth now provides streaming output of the build scripts if either the verbose or debug output levels are enabled, instead of only getting the output when the container stops.
* When builds took longer time to execute than 100 seconds, the run time of the container was outputted in scientific format, this has now been corrected so it will always be outputted as the number of seconds with 1 digit precision.