- updated changelog with new features

- Porting to Tomcat 8/Servlet 3.1, Java 8, Ubuntu 16.04 LTS
- Replaced ubuntu package dependency on JDK with JRE
- JSON support (added dependency on Jettison):
	- New config file for XML namespace to JSON prefix mappings
- Update license headers for new year 2017

- Parent project: 3.4.0 -> 4.1.1: 
    - Apache CXF 3.1.0 -> 3.1.9
    - Java Servlet API 3.0.1 -> 3.1.0
- authzforce-ce-core: 5.0.2 -> 6.1.0:
	- Saxon-HE 9.7.0-11 -> 9.7.0-14
	- Spring 3.2.2 -> 4.3.5,
- authzforce-ce-pap-dao-flat-file: 6.1.0 -> 7.0.0
- authzforce-ce-core-pdp-api dependency version: 8.0.0 -> 8.2.0
- Added unit test expecting 400 Bad Request when pushing policy with
invalid function ID in Apply statement