Changes to 'dev/collection_invalid'

[Sandro Knauß]

New branch 'dev/collection_invalid' available with the following commits:
commit aa65ce218b20cf6792887d6860591e2eef9ceb38
Author: Sandro Knauß <knauss at kolabsys.com>
Date:   Sat Oct 25 14:38:44 2014 +0200

    Starting CollectionFetchJob should not fail with invalid collections
    
    If running CollectionFetchJob with a list of collections, where
    invalid collection ids. CollectionFetchJob should run all subjobs to
    return a list of valid collections.
    
    KOLAB: 3829