Resolve "Switch validity range and group select"

Closes #42

See merge request !29

Bump version to 0.1.0.dev1

See merge request !28

Resolve "Drop substitution stuff"

Closes #6

See merge request !27

Resolve "Adapt to refactored CRUD lists"

Closes #40

See merge request !26

Resolve "Fix migrations"

Closes #39

See merge request !24

Resolve "Drop sites framework"

Closes #38

See merge request !20

Update tox.ini

See merge request !14