Initial official version (v2.0) - updated for IRIS.

This code is for estimating the mean rate of particles detected with a Timepix detector using the method described in Section 3 of the CERN@school Contemporary Physics paper (Whyntie et al. 2015) and the accompanying background radiation measurement "how-to" guide on FigShare. There is also code for plotting the time profile (i.e. the number of pixels detected over a time series) for a given dataset for a given day. The datasets featured in the paper are included with the code, but may also be found on FigShare here. This release is the official v2.0 version for the Institute for Research in Schools (IRIS).