2.8: Updated release notes with changes since 2.7.5
2.8: Updated release notes with changes since 2.7.5

git-svn-id: 02b679d096242155780e1604e997947d154ee04a@1591440 13f79535-47bb-0310-9956-ffa450edef68

apache/jackrabbit,apache/jackrabbit,apache/jackrabbit