Enable bootstrapping via make.

There's a current recipe that tangles out an updated Makefile from the
org file itself. So, 'make Makefile; make' is sufficient to pull out
an update and do ... whatever.
Pull ngram data from Google's (US) English book datasets.

Since these are big blobs of data, I'm also telling git to ignore
them. I think that's appropriate, but I could be wrong.
Summarize just the 1-grams for 'beards?'.
Tweak python code blocks to conform with org session conventions.
Whoa. Bitcoin is way better to analyze than ngrams.
Use pandas! Much nicer than hand-hacking time series analysis in numpy.
No coding changes. Sketch out some notes for an outline.
Merge remote-tracking branch 'origin'