Merge pull request #8 from Connexions/to-json

Basic collection tree to json method
Set the timezone of the tests to what the tests expected

Set the timezone of the tests to America/Whitehorse (-7/-8) because the
date times in MODULE_METADATA and COLLECTION_METADATA created and
revised are hardcoded to be -7.  If the system timezone is not -7 then
the date times will be different.