Changes to 'dev/group_expansion'

[Sandro Knauß]

New branch 'dev/group_expansion' available with the following commits:
commit c4a381d27104d8d897a1905718ca10a84d7dda8e
Author: Sandro Knauß <knauss at kolabsys.com>
Date:   Mon Jan 12 14:29:19 2015 +0100

    Make contactgroupexpandjob async.
    
    Normally all Jobs should be async if you use them with start.
    
    KOLAB: #4212