change enumeration to use JSON array as outer container

[jgehrcke]

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[jgehrcke]

See commit message:

I did not want to break this,
but given the access numbers (<50 requests
in the last 24 hours) I think it is fair to 
better break that early than later.

The output of individual samples should be
_ordered_, i.e. in an array, so that one
can, for instance, easily access the last
sample.

Consumer sneed to parse through the
individual timestamps anyway: it is unlikely
that consumers index a map with an
_exact_ time string.

Sorry for the inconvenience, but I think this was really important.

[jgehrcke]

Resolved via ae7f386