www/js/tetrad-map.js - add a legend
www/js/tetrad-map.js - get the options from a controller variable

Instead of from element attributes.
www/js/tetrad-map.js - change thresholding impl. to allow >1
www/js/tetrad-map.js - use 1950 and 2000 as threshold years for periods

And add a automatic transform from the dateThresholds object to the
legend data.
www/cheshire-dataset.json - add updated data from Des
www/js/tetrad-map.js - remove a fossil
www/cheshire-dataset.json - new format: add completed data

Top-level element is now an object, with "completed" (a list of
completed grid references, assumed to be tetrads), and "taxa" (a list
of taxon data, i.e. the original data).
www/ - adjust tetrad-map to render completed tetrads with small red dots
remove console.log
www/index.html - insert full title

As suggested by Des.
www/index.html - amalgamate two #messages style sections
www/test-dataset.json - update data format to match cheshire-dataset.json
www/3p/ui-bootstrap.js - upgrade from 0.3 to 0.6

We need the modal dialog.
www/ - add 'About' button which opens modal dialog

That explains the project raison d'etre and software author.