Implement loop with input test

See merge request !47

Currently only the status of the main algorithm container
was taken into account to gather the stderr output of all
other containers. This patch changes this so that if
something fails but the main containers ends successfully
the other containers output can still be analysed.

Not all tests were checking for None which might happen
for reason outside of tests error.

These two algorithm allow for better testing of a complete
experiment with a database used for input of both loop and
loop user algorithm.

Temporarily remove framework trove classifier to unblock pypi upload…

See merge request !50

[setup] Temporarily remove framework trove classifier to unblock pypi upload (c.f. issue beat.backend.python#19) [ci skip]

merge new documentation to master

See merge request !48

Update the docker image versions.
Add notice for newer version check.

1.7.x

See merge request !46

It was already not used when stream is set to false however in
more recent versions of the python docker bindings, an error is
raised if stream is set to false and and decode to true.

Soft loop

See merge request !43

Docker test

See merge request !44