Nuxeo java client 3.3.0

This release contains the following:

Features:

JAVACLIENT-184: Handle refresh token when using OAuth2 authentication
JAVACLIENT-167: Add a getPropertyByXPath API

Bug fixes:

JAVACLIENT-155: Fix Task deserialization
JAVACLIENT-82: Fix usage of task complete call

Clean ups:

JAVACLIENT-183: Update dependencies
JAVACLIENT-182: Integrate LTS 2019 version

⚠️ This is the latest Nuxeo Java Client release compatible with Java 7, the next one will target Java 8 and next.