Add Funnel Visualization on Workspace

[#1]

 HI,

1. It would be really great if workspace have funnel visualization implemented on it. 

2. Add unlock function on graph visualization after lock function is active.

Thanks

Arif

[#2]

Hi Arif,

Request #1 is in progress (we're working on adding funnel visualizations now). 

If I understand your second request, it's about clarifying whether Lock Selected Items or Lock Selected Positions is active. My understanding is that only one can be active at a time, and it's not very clear which is selected with the current design. Excellent feedback.

[#3]

Implemented as of 20 October 2016. Use the Fallout visualization to do funnel visualization and analysis.