Initial work on Get implementation.
Merge remote-tracking branch 'origin/next' into get_implementation

Conflicts:
	src/maidsafe/vault/data_manager/service.cc
	src/maidsafe/vault/data_manager/service.h
	src/maidsafe/vault/maid_manager/service.h
	src/maidsafe/vault/operations_visitor.h
Merge branch 'next' into get_implementation

Conflicts:
	src/maidsafe/vault/data_manager/service.h
Merge remote-tracking branch 'origin/next' into get_implementation
Merge remote-tracking branch 'origin/vault' into get_implementation

Conflicts:
	src/maidsafe/vault/data_manager/service.h
	src/maidsafe/vault/operations_visitor.h
Modified groupdb