Removed dependency between livedesk plugin and content-article

The blog post service was using the AsLikeAll criteria from the
content-article plugin.
LB-435: Upload avatar

fixed.
Merge pull request #13 from mugurrus/liveblog-13

LB-435: Upload avatar
LB-495 : Manage Collaborators is broken
Merge remote-tracking branch 'sourcefabric/liveblog-13' into liveblog-13
Merge branch 'liveblog-13' into qa-sprint-19-04