Allow renderable with content.

[jbenden]

This patch permits the with option, of tasks, to contain
Jinja2 renderable content. This is useful when the models
section contains data to be reused across a number of tasks.

[Nachtfeuer]

Like it. Will Check soon. I‘m looking forward to rollout it together with current milestone. Also I will add that to the documentation.

[coveralls]

Coverage increased (+0.02%) to 97.139% when pulling 7c51b6b on jbenden:rendered-with into 2e1aa3d on Nachtfeuer:master.

[jbenden]

It seems that CI failed to run for reasons that may not be because of coding errors. Any help would be greatly appreciated, to accelerate acceptance of this change.

[Nachtfeuer]

Mmhhh ... from two failing builds the one has failed by downloading the base system. I restartet it. But Python 3.6 has failed because of this:

Traceback (most recent call last):
  File "/home/travis/build/Nachtfeuer/pipeline/tests/components/test_docker_container.py", line 28, in test_creator_complete
    assert_that(len(output), equal_to(1))
AssertionError: 
Expected: <1>
     but: was <0>

Could you please have a look at that?

[jbenden]

I had been experiencing this failing test, previous to the myriad of PRs I've created. I suspect that one of them in fact solves the problems seen here.