OAK-1604 - Support for signed references in Blob (WIP)

-- Adding support for reference in AbstractBlobStore
-- DataStoreBlobStore would not return reference for in lined blobs
-- Adding fixture for FileBlobStore

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1581724 13f79535-47bb-0310-9956-ffa450edef68
OAK-1604 - Support for signed references in Blob (WIP)

-- Adding fixture for FileBlobStore

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1581725 13f79535-47bb-0310-9956-ffa450edef68