MRC: ACLs returned via the 'xtreemfs.acl' attribute are now JSON-encoded to...

MRC: ACLs returned via the 'xtreemfs.acl' attribute are now JSON-encoded to ensure a proper decoding if special characters are contained in entity names

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@2853 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534