ISPN-263 Handle cluster partitions

https://issues.jboss.org/browse/ISPN-263
A good starting point is the documentation commit which describes the implemented functionality.
Most of the code is around playing with state transfer so dan's input is important :-)
I think it would be simpler to iterate over all the segments from 0 to numSegments - 1 and check if any of the segment owners are in the list of new members.