ISPN-4966 The <backups/> element should be a sub-element of all cache-types, not just clustered caches
Update locking documentation

* added how it works in clustered caches
ISPN-4970 AvailabilityException and AvailabilityMode are in the wrong package
ISPN-4970 AvailabilityException and AvailabilityMode are in the wrong package

Move the impl package as well
ISPN-4981 Update to Hibernate Search 5.0.0.Beta2
ISPN-4981 Spatial Query updated API: onCoordinates -> onField
ISPN-4902 Unsupported Class Version Error when running testsuite with JDK6

Update documentation.
Replace sfl4j-jdk14 dependency with sfl4j-log4j12 so that jboss logging
writes to log4j in the cdi module (and dependents).

Add more debugging around cache listeners. It seems Class.getMethods()
sometimes returns synthetic methods created by overriding a generic method.