Update tubalmartin/cssmin to v2.4.8-p4
Merge pull request #124 from soycamo/issue-123-updating-cssmin

Update tubalmartin/cssmin to v2.4.8-p4
show line labels regardless of chart width
fixed ios iframe reload bug
fixed pie-chart animation bug in firefox
guess number format if user hasn't specified any
use full number format after updating the chart
this fixes the bug that text prepended or appended to numbers
disappears after updating the chart
update axis labels on chart updates in column charts
fixed bar chart scrollbar bug
setting overflow-y to hidden when iframe is bigger than the chart
don't track charts with Piwik anymore
Merge branch 'master' of https://github.com/datawrapper/datawrapper