Changes to 'dev/collection_invalid'

[Sandro Knauß]

New branch 'dev/collection_invalid' available with the following commits:
commit 2a8970d0cffe4089d8db854b228d8c7f3ad194d0
Author: Sandro Knauß <knauss at kolabsys.com>
Date:   Sat Oct 25 14:38:44 2014 +0200

    Starting CollectionFetchJob should not fail with invalid collections
    
    (fast bugfix)
    If running CollectionFetchJob with a list of collections, where
    invalid collection ids. CollectionFetchJob should run all subjobs to
    return a list of valid collections.
    
    Therefore I do not return a error if the fetch fails, i overwrite
    handleResponse.
    
    Known issues:
    * no tests
    * never fails ( if all subjobs fails)
    * we should be able to set the mode "fail on first error" like before
    
    KOLAB: 3829