Add a minimum width on columns
Add padding bottom in left column

Allows the user to see the tooltips of the last dimension even if aggregated
Remove tooltips on redraw / render

Tooltips sometimes get stuck, for ex when you aggregate a dimension while a tooltip is shown, the tooltip will keep floating forever.
Fix tests for drill-down
Allow adding tips in constants
Increase default delay for play
Change margins & labels for bar & timeline
Use of 'translate' function in 'transform' attribut.
Add utils namespace for utility functions
Update web demo
Fix colors: use a color for 0 value, not grey
Add support for hideUnfiltered + structure for topK options on charts
update dc dependancy