Rest services

Closes issue #65 

'pree2e' and 'ci' scripts added

Fixed an issue where, if you called findAll or findById multiple times in a row, all network requests were cancelled except for the last one.

Reinstated npm as a dependency

Hal serializer

Made a clear distinction between IDs and UUIDs - as IDs will probably change in the future to be easier to work with (shorter urls) and applicable to multiple versions of a resource

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