Merge pull request #1 from chanke/new_design

New design
Fileserver-unittest: use test-cell and

new setup and teardown methods.
LookupUtil.get_fsuuid: do return the uuid

the return call was no there.
design-doc: amend responsibility of DAO

a object of a DAO does not have to be complete.
It is the task of the service to fill in the gaps.
ASYNC: first implementation of an async service

together with it's unit-test.
not complete yet
Merge pull request #96 from chanke/master

update to current