Merge pull request #96 from sonatype/nexus-5836-browse-index

NEXUS-5836: Browse Index Tree fix
Conflicts:
	plugins/indexer/nexus-indexer-lucene-plugin/src/main/java/org/sonatype/nexus/rest/indextreeview/IndexBrowserTreeNode.java
	testsuite/legacy-testsuite/src/test/java/org/sonatype/nexus/testsuite/group/nexus3567/Nexus3567GroupMemberChangesIndexIT.java
	testsuite/legacy-testsuite/src/test/java/org/sonatype/nexus/testsuite/index/nexus2120/Nexus2120EnableDownloadRemoteIndexIT.java
@since 2.6.1