OPEN - task 27: Exceptions in EMF-Frag editor when selecting objects 
http://github.com/markus1978/emf-fragments/issues/issue/27

Fixed that issue: I was using the wrong mongo features to realize
checkAndCreate, I am now going for unique indexes that do not allow two
entries with the same key.
OPEN - task 28: Only fragment roots ....
http://github.com/markus1978/emf-fragments/issues/issue/29

Completely reworked the fragmentation updates after containment and
resource changes. Old code is still in there as comments. Still no tests
for correct UOC-handling of non fragment root object moves.
OPEN - task 29: Only fragments roots are handled correctly when objects
are moved 
http://github.com/markus1978/emf-fragments/issues/issue/29

Removed old code "residue".
Added incremental updates for UOC and Ids when fragmentes or container
change on internal objects.
OPEN - task 30.

Switched the mongodb store from key:String to key:byte[] and force keys
to be 17 bytes long (don't know if that is enough). 
Minor fix for XMI-Fragments, save did to much to its objects
Fix on BinaryFragments, see #30.
Minor patches.
Performance fixes.
As guessed the key length was too short.