Return null result properly for cloud function (parse-community#862)

Add KTX module (parse-community#860)

* Add KTX module

* Add contribution note

* Add a few other extensions related to primative support

Make PointerEncoder public for LiveQuery (parse-community#859)

Make things public for LiveQuery (parse-community#858)

Nullability annotations (parse-community#857)

Bump version

Bump to 1.17.2

Add upgrade instructions

Add POM metadata back

Bump to 1.16.7