Conflicts:
	pdp-engine/src/main/java/org/ow2/authzforce/core/pdp/impl/policy/CoreRefPolicyProvider.java
	pdp-io-xacml-json/src/test/java/org/ow2/authzforce/core/pdp/io/xacml/json/test/JsonProfileConformanceV3Test.java
	pom.xml

	- Changed PolicyProvider API. See CHANGELOG on core-pdp-api repository.
- Fixed #38 (GitHub)
	- Removed CoreRootPolicyProvider
	- Replaced CoreRefBasedRootPolicyProvider with CoreStaticPolicyProvider

environmentProperties

4.3.20:
	- upgraded authzforce-ce-parent: 7.5.1
	- authzforce-ce-xacml-json-model: 2.1.1
- Fixed CVE-2018-1000873 on Jackson (Jongo dependency): upgraded:
	- jackson-databind: 2.9.8

- upgraded authzforce-ce-core-pdp-api to 15.3.0
- Added dependency on java.xmail v1.6.0 as mail-api implementation for
XACML RFC822Name validation
- Upgraded dependency authzforce-ce-xacml-json-model to 2.1.0
- New feature: policyLocations in native Policy Providers'
configurations support (not only PARENT_DIR property but also) system
properties and environment variables (enclosed between '${...}')
- Changed copyright company name to Thales
- Added unit test for DefaulEnvironmentProperties#replacePlaceholders()

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