Support API filtering on reverse related fields

Merge pull request #62 from JeroennC/master

OPT: Support filtering on reverse related fields

FIX - Add SKIPPED to the PipelineRun final statuses

Merge pull request #61 from JeroennC/master

FIX: Add skipped to final pipeline run states (#TIPD-2204)

SCMPipelineRun create returns 409 on duplicate

The response content contains a code already_exists if it already exists, and parent_commit_missing if the pipeline run cannot be created because there is no pipeline run for the parent commit. The latter case was previously the only cause of a 409.

Django admin improvements

Merge pull request #59 from kpn/feature/team-admin-slug

Feature/team admin slug

Do not add skipped pipeline runs to releases

Merge pull request #58 from kpn/feature/skipped-no-release

NEW: Do not add to a release when pipeline status is SKIPPED

Drop new BB events that can't be linked to existing ones

Merge pull request #57 from CCardosoDev/feature/drop_unlinkable_plr

OPT: Drop BB events that can't be linked

Sort releases and pipeline runs by created_at datetime

Merge pull request #56 from CCardosoDev/feature/black

OPT: Add black for auto code formatting

Filter CRUD on all kinds of fields

Merge pull request #54 from kpn/feature/filter-on-all-fields

NEW: Allow filtering on all fields

Bugfix for commit ordering

We forgot to update the serializer for the new first_parent_commit field on the SCM pipeline runs. This field would be ignores, so it would like like several 'first commit' pipeline runs instead of a nice linked list.

This problem has been corrected and tests have been added to make sure this does not regress.

Process commits in order

Merge pull request #52 from kpn/feature/commit-order

Feature/commit order