Documents containing Infinity cause error

[9point6]

Hi,

Similar to #164, If a document in a collection contains Infinity (or -Infinity) the page load will fail when trying to list the collection.

An inspection of the request responses shows the following error:

{"error":"815: -Infinity not allowed in JSON","status":500}

This happens on both stable and dev releases

(Thanks for the great project btw!)

[richthegeek]

Fix available in #166