Version 0.4.1 2016-08-12

   - Changed notebooks to keep lists of results for each point in
     their parameter space
   - Improved handling of pending results
   - Allowed addition of lists of results, and experiments that return
     lists of results
   - Made all the classes "new style", based on object
   - Changed Experiment metadata to use datetime objects
   - Added Python datetime <-> ISO datetime string handling to JSON
     notebooks
   - Improved notebook persistence tests
   - Refactored repeated experiments to separate repetition and
     summarisation

Version 0.3.1 2016-07-29

   - Made parameter spaces of a single point work properly
   - Re-wrote Experiment to clean up the logic and allow better
     repetition 

Version 0.2.1 2016-07-28

   - Test suite skips cluster tests if there isn't one running
   - Added repeated experiment combinator
   - Removed SQL-backed notebooks for the time being, until finished

Version 0.1.1 2016-07-15

   - Initial experiment, lab, and notebook implementations
   - Cluster labs
   - Test suite
   - Persistent notebooks to JSON; SQLite outlined but not working
   
