[#84] fix brush rounding issue when bar is centered
improve unit test compatibility
improve spec time related compatibility
improve spec time related compatibility
turn on ci status on readme.md
making bar chart working with empty groups
[#90] improve bar/stackable chart's handling of empty groups
[#89] introduce ordinal units
[#89] implement ordinal based rendering in bar chart
[#89] improve ordinal bar chart test cases
[#89] turn off brush if ordinal is on for bar chart
[#89] improve line chart support for ordinal scale
[#89] implement single value selection on ordinal bar chart
[#96] fix issue #96 in single selection chart
Manually merged pull request #97 and added test guard for ordinal bar char filtering
fix #98 on bar chart ranged selection
[#103] fix broken bubble chart selection
improve filtering robustness
improve filtering robustness
[#108] only draw bars within x domain