read_data.py now listens for keypresses to make data collection easier

Implementation was simple: single method heardKeyPress listens for a single character coming from stdin. If a keystroke is detected, we write a special line to tsv file to signal end of one data 'point' and beginning of collection for a new one.

NB: This implementation is very fragile as it depends on the number of cols in the tsv...

TODO: Add a check for the col #s before writing to disk.