- org.everit.json.schema: 1.6.0 -> 1.6.1
- guava: 21.0 -> 22.0 to prepare upgrading
- json: -> 20171018

  - Spring: 4.3.6 -> 4.3.12 
  - CXF: 3.1.10 -> 3.2.1
  - JAX-RS (javax.ws.rs-api): 2.0.1 -> 2.1
  - Added org.json:json and org.everit.json.schema to dep management
- Upgraded OWASP dependency-check maven plugin: 1.4.4.1 -> 3.0.1
- Added XacmlStatusCode enum class for standard XACML 3.0 status codes

- Updated java comment to XACML 3.0 for XACML Resource Scope
- Changed class names according to class naming convention: only first
letter in acronym is uppercase
	* XACMLAttributeCategory -> XacmlAttributeCategory
	* XACMLAttributeId -> XACMLAttributeId
	* XACMLDatatypeId -> XacmlDatatypeId
	* XACMLNodeName -> XacmlNodeName
	* XACMLResourceScope -> XacmlResourceScope
	* XACMLVersion -> XacmlVersion

documents with JAXB and schema validation

attributes from PDP XSD model, because not supported by all decision
cache implementations, e.g. Guava cache does not support other
memoryStoreEvictionPolicy than LRU
(moved to extensions' respective models)