make primary hash index hash function explicit
fixed rollback of updates
fixed some memory errors
nullptr
changed crud signatures
Merge branch 'devel' of https://github.com/triAGENS/ArangoDB into devel
clean up when journal creation fails
Merge branch 'devel' of https://github.com/triAGENS/ArangoDB into devel

Conflicts:
	arangod/VocBase/document-collection.cpp
Merge branch 'devel' of https://github.com/triAGENS/ArangoDB into devel