Plotswork

I think this is how it works, I added the "interpolated.html" which is a graph which gets real-time data from firebase (or any json source).  I will try to style it next.

Slowing the update speed:
I tried doing a bunch of setTimeouts, but it seems a better way to set a delay for the function is to increase the "delay" in the tick() function called "path". 

Added the d3 libraries to js folder;
I also Added the d3.js and d3.min.js libraries to the .js folder.