Merge pull request #388 from quamilek/release/2.1.0

Release 2.1.0 - to master
Merge branch 'master' of https://github.com/allegro/ralph_assets into develop
Merge branch 'develop' of https://github.com/allegro/ralph_assets into develop
Merge branch 'develop' of https://github.com/allegro/ralph_assets into develop
Update CHANGES.rst
Bumped version to 2.2.0
Update CHANGES.rst
Merge branch 'develop' of https://github.com/allegro/ralph_assets into develop
Merge pull request #411 from allegro/release/2.2.0

Release/2.2.0
Add doc test build to Makefile
improved redirection urls
Merge pull request #418 from quamilek/test-doc

Add doc test build to Makefile
Merge pull request #414 from xliiv/modes-in-attachments

simplified mode in attachments
Merge branch 'develop' of https://github.com/allegro/ralph_assets into develop
Merge branch 'develop' into mode-in-supports

Conflicts:
	src/ralph_assets/views/attachment.py