cmaurer/angularjs-nvd3-directives — pull request #165 by sebastibe (2014-03-22 13:33:06+00:00)
Title: Sparkline chart has no xAxis but has xTickFormat attributes

Sparkline Charts have no xAxis/yAxis hence the `xaxistickformat` and `yaxistickformat` options cause a bug, however nvd3.SparklinePlus has `xTickFormat` and `yTickFormat` we can use for the hover legend.