"Introspecting a Treant's Tree" example could use more character

[dotsdl]

At the moment I've included a brief example of how the filesystem manipulation machinery built into Treants can be used with other packages, such as storing a pandas DataFrame and examining the file. This uses a randomly-generated DataFrame at the moment, but we could do better with a small DataFrame that has, e.g. tree nut data or bark varieties data. Currently the randomly-generated values are too long for the page column, too.

Anyone want to hammer on this? It's pretty isolated, but can be fun.

[dotsdl]

@sseyler?

[dotsdl]

Not really necessary, but leaving this up in case the spirit moves someone. Once it goes to review we can perhaps change it to make it better.