Add number of nodes and number of acts to output

[christofs]

I think it would probably be useful (and would certainly not hurt) to add "number of nodes" (= dramatic characters) to the output. They are extracted anyway to calculate some other measures I believe.
And it wouldn't hurt to have the number of acts in addition to the number of scenes, just to have more complete data.

[peertrilcke]

"number of nodes" = "charcount" (https://github.com/lehkost/dramavis/blob/master/dramavis.py#L287) ?

[christofs]

True I guess!

[lehkost]

I think we can close this one.