@trivial: update README and remove run mode 'upgrade', which is only available for Oak Runnable JR2 and which is documented there

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1629655 13f79535-47bb-0310-9956-ffa450edef68
OAK-1941 - add test that checks that interesting characters round-trip in property values

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1629670 13f79535-47bb-0310-9956-ffa450edef68