Left column, leftColumnWith and small devices

[soulgalore]

First again PerfCascade works perfect in sitespeed.io and it makes our result pages look great, thank you @micmro :)

One thing I wonder how we can tweak is the left column when you check the graph on a device with a smaller screen. The waterfall renders great but I wonder if there's could be a way to automagically make the left column with the name larger?

It's hard to see things on a waterfall graph on a small device and I'm thinking that the order of the assets is important and that you can see what is downloaded when. @micmro @tobli any input?

[micmro]

I think we can solve that with a bit experimenting. What about adding a min-width option? Alternatively (or adaptively) we could automatically increase the legend/graph-ration if the screen with is less than a specific size - though this might collide with leftColumnWidth.
If you need something very specific you could also set the leftColumnWidth option while initializing PerfCascade, based on the users browser.
One other thing we could do is just showing the last url-segment (without domain) if the screen width is small.

Are many users checking sitespeed.io results on mobile? I have not spend too much time thinking about optimizing their experience until recently (#186 has one improvement for touch users).