divides options into Basic and Advanced options

Advanced options default to hidden, only show if you click the little icon. Uses localStorage to persist the preference.

Eventually, I'd like to find a more intuitive way to surface some of the "advanced" tools in intuitive ways, (e.g. Did the data come out wrong? Try Spreadsheet mode!) but this'll do for now.

Like this, with advanced options expanded:

![tabula-advanced-options](https://cloud.githubusercontent.com/assets/548250/3113760/3d6da7c2-e6e2-11e3-88cf-272359993815.png)


What do you all think? Is this a fruitful distinction? Worth it as an intermediate solution?