Label cells with B, LP, & LT classes

## Aims

Milestone 1
Find the cell labels (maybe in table on google drive under "Files from Nick")
Label the 9 cells in the trees in Mei's BioPython tutorial notebook

Milestone 2
Add cell labels to fastq, etc. files, so they are easy to bring up when needed during analysis

## Background

The aim of this project is to see how the three cell types (Basal, Luminal Progenitor, and Luminal Terminal) cluster.

We have generated fasta files that capture a fraction of the variation between chromosome M gene sequences of 9 cells (link to data01 repo be added soon). We have also generated some lineage trees with those sequences (link to Mei's ...BioPython-Tutorial....ipynb to be added soon). And we have info with cell labels somewhere (table on google drive or maybe in sra?).

- If you are interested in this issue, ping me (@Deena) on Slack, so I can add the links referenced above. Go [here to join Slack](http://bit.ly/JoinSlackFastaiSFbay)