Squad-client

This 0.21 release sends download_url to TuxBuild build
test results. It also fixed differences when dealing with
backend MetricThreshold objects.

A nice feature added in this release is an extra arg
in create-or-update-project command: --thresholds.
That allows users/CI to automatically create necessary
thresholds per project.

Complete list of changes going in:
* commands:
* create_or_update_project: add --thresholds arg
* submit_tuxbuild: add downlaod_url to ALLOWED_METADATA
* submit_tuxbuild: splitup ALLOWED_METADATA
* core: models:
* add metrics to build
* add relation between project and metric thresholds
* tests:
* fixtures: fix fixtures for new versions of squad
* test_models: fix typo fixed in SQUAD

This 0.20 release used warnings_count of tuxbuild result
file to send as metric to SQUAD.

Complete list of changes going in:
* commands: submit_tuxbuild: send metrics

This 0.19 release adds a command that allow users to
send job requests to SQUAD.

Complete list of changes going in:
* commands: submit-job: submit job requests command

This 0.18.3 release fixes a bug submitting TuxBuild results
due to an upstream dependency (jsonschema) update.

Complete list of changes going in:
* submit_tuxbuild: set schema version

This 0.18.2 release fixes an issue in Docker that prevented
running containers by calling out /bin/bash

Complete list of changes going in:
* Dockerfile: remove entrypoint to allow /bin/bash to be called out

This 0.18.1 release is a quick release on the Docker
image to restore the original entry point to bash
(it was python's console after)