Fix JSON data point serialization so it picks the proper Jackson writeNumber()
method depending on the type of the data point

Signed-off-by: Chris Larsen <clarsen@euphoriaaudio.com>
Fix HttpResponseStatus.ACCEPTED comparisons in HttpQuery and always set the
status of the response object.

Signed-off-by: Chris Larsen <clarsen@euphoriaaudio.com>
Fix DateTime.parseDateTimeString() to allow for Unix style timestamps of 0 and
up instead of requiring 10 digits.

Signed-off-by: Chris Larsen <clarsen@euphoriaaudio.com>