Bump version to v0.5.2

Includes chartjs#44, chartjs#45

Hotfix to v0.5.0

Adds back a variable reference that was removed by mistake.

Bump version to v0.4.3

Hotfix for v0.4.1

Bump version to 0.4.0

Bump version

update readme

v0.1.1 release prep

Built files for 0.1 release