Doc fixes
Minor fixes.
Updated and prepared for building with Java 8. Yeah.
Merge branch 'master' into 2.0

Conflicts:
	agent/core/src/test/java/org/jolokia/backend/MBeanServerHandlerTest.java
	agent/jmx/src/test/java/org/jolokia/jmx/JolokiaMBeanServerUtilTest.java