@dzucconi: Grab bag of bugs/polish

![image](https://cloud.githubusercontent.com/assets/555859/4957998/ecafea6e-66a9-11e4-9321-be1b0e2a8afe.png)

I dunno how much of a deal this is for this app but maybe pull out the z-indexes into a central map. On a related note was looking at this the other day: https://github.com/jasongornall/stylushelp which includes some nifty things for normalizing and viewing z-index values.