WIP Fixes #3

Queries the Riverlab endpoint https://app.extralab-system.com:8007/data/Monticello/lastpoint every 30 seconds and if
it finds a new datapoint based on timestamp, (timedate field) it adds it to the file. It uses pandas to load the
file from disk every time and merge in the new row.

plot.py includes simple code to plot the data in the CSV file using pandas and matplotlib.

TODO

• Use a scheduler instead of while time.sleep loop
• Should we start new files after a certain number of rows?
• Post to the geostreams api