refactor to ChartGroup tests, renamed crossfilter variable in Dimension, refactor to Chart.highlight()
changed equality comparison in Dimension
fix to assertions in ChartGroup tests
compress task removed
removed package.json entry for compress, and zip file
Merge pull request #92 from Stavrakakis/master

ICS-58: Implement ChartGroup, remove clutter from global namespace and general decoupling
auto margin now working, series now using dataset() instead of data.getData(), series can use plain old array instead of insight.DataSet
automargin working for row and column series by abstracting away x/y to key/value
automargin now uses small amount of label padding
Merge branch 'fix/automargin' into develop