release 1.0.23

release 1.0.22

release 1.0.21

I forgot to update the version number in setup.py, so bump version to 1.0.21 to make sure that this correct and complete release is actually recorded in a commit.

release 1.0.19

release 1.0.18

release 1.0.17

releae 1.0.16

release 1.0.15

release 1.0.14

release 1.0.13