loadmat path differs in local repo vs github.io

[Mark-Kramer]

In github.io, to load a MAT file requires a longer path. For example, in 01:

mat = sio.loadmat('content/01/sample_data.mat')

while locally, the path is simply:

mat = sio.loadmat('sample_data.mat')

[Mark-Kramer]

Make sure to run Thebelab within the notebook.