XSS in piechart legend

[ecneladis]

Applies to every type of legend - On Graph, Table and Right side.

[jokerlee]

same issue to grafana/grafana#4117

[ferozsalam]

I have submitted #163 to fix this.

[ferozsalam]

This is now CVE-2015-9282

[briangann]

merged fix, @ferozsalam thank you for your contribution!