OAK-987: Implement the MicroKernel API

Implement copy and move operations

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1533606 13f79535-47bb-0310-9956-ffa450edef68
OAK-987: Implement the MicroKernel API

MicroKernel.write() requires two identical streams to have identical identifiers
Initial support for serializing multi-valued properties.

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1533607 13f79535-47bb-0310-9956-ffa450edef68