Removed obsolete groupNameTemplate property.
Made text color white on selected Time Sales Tabs.
Fixed tooltip template for Sales by Genre chart.

The template was trying to output the genre name, but was coming out as
'undefined' due to the bug described here:
http://www.kendoui.com/forums/kendo-ui-dataviz/chart/tooltip-template-using-dataitem-not-always-working.aspx.
We removed the code from the template for now - can be returned when
this bug is fixed.
Fixed social stats chart when changing artists.