NF+MSC: figure with dataset I/O
WEB+EXC: nuke some old exercises from the index
WEB: add pics to philosophy
WEB+BF: fix ref in measures
WEB+RF: restructure philosophy
RF+ENH+EXC: make nicer searchlight_measure example
EXC+BF: fix check for confusion matrix
WEB: update acknowledgements
MSC: let README refer to website