merge develop into master for tonic 0.1

[jhamman]

We need a tag for tonic. This will update the tonic master branch and I will create the 0.1 release following this merge.

[landscape-bot]

Repository health increased by 3% when pulling 6e61d48 on develop into e608d64 on master.

• 27 new problems were found (including 0 errors and 16 code smells).
• 23 problems were fixed (including 5 errors and 14 code smells).