release 0.2.1
fix tooltip for line charts
release 0.2.1
fix left padding for null y axis
cosmetic fix for consistency
init legend plugins
update prototype
update prototype
layout and legend for charts
layout and legend for charts
update prototype
update prototype
update prototype
update prototype
fix tests
fix tests
add tests
prepare release
Merge pull request #12 from TargetProcess/legend

add legend plugin
add tests for legend plugins