Added pentagons

**We added pentagons, and displayed more statistics.**
We also made the graphs show the average meh'ness of the shapes, and the average sadness.
Part of what was needed to make this work was a trippleslider. We created an nslider, which will automatically transform itself from double- to triple- to four... n- slider depending on the number of inputs. It is probably slightly broken in places.

We did this primarily as a fun exercise.
I am proposing a pull request because Twitter is difficult. **Don't pull this.** Your code is great as it.

So here is what I wanted to say:
**Your code is beautiful.** 
It is simple to understand and well commented!
We managed to make these hacks in 2 hours because 
of the elegant and easy way in which the code is written.

**Thank you.**