A little tidying

As well as a typo in the readme, a long overdue tidy of the package dependencies (removing those that were used when the client was here).

Express.js is fixed at version 3, so we don't stumble into using version 4 which looks to need some changes.

Do the test work? I have corrected one, that would never work on windows as the directory path is differently formatted. But, other tests don't complete on Windows - don't think they ever have(?) - do they work elsewhere?