Fix error in how the classlist is applied to become IE 10 safe.
Merge branch 'master' of github.com:dwt/rickshaw into 337_renderer_missing_support_for_seriesStrokeFactory

merge upstream
Merge branch '337_renderer_missing_support_for_seriesStrokeFactory' into yeepa

do it
Update merge
Work around classList api incompatibiliy
Merge branch '337_renderer_missing_support_for_seriesStrokeFactory' into yeepa