Documentation cleanup.

The list of packages to exclude from javadoc looks like this (in this PR):

*.impl.*:*.internal.*:org.neo4j.ext.udc:org.neo4j.kernel.ha:org.neo4j.kernel.ha.*:org.neo4j.com:org.neo4j.com.*:org.apache.lucene.index:org.neo4j.cluster.*:org.neo4j.consistency:org.neo4j.consistency.*:org.neo4j.helpers.progress:org.neo4j.kernel.configuration:org.neo4j.kernel.guard:org.neo4j.kernel.info:org.neo4j.kernel.logging

I'm not sure this is correct, so please verify there's no package in there we actually should have in the public javadocs. Too see what javadocs we currently publish, have a look at http://components.neo4j.org/neo4j-enterprise/snapshot/apidocs/index.html