LB-842: When a chained blog provider is deleted, the already selected blogs still appear on chained blog source
* chained blogs (in liveblog, liveblog-sync) filtered for having providers (or none origin_uri as legacy)
Merge branch 'liveblog-15' into lb-842-hide-orphan-chained-blogs
LB-842: When a chained blog provider is deleted, the already selected blogs still appear on chained blog source
* updating the source on re-enabling a chained blog
LB-819: On timeline all posts are 2h before CET

Use dust userdate helper for timeline dates.
LB-873: User managed banner ad on top of the blog - backend
api, model
LB-873: User managed banner ad on top of the blog - backend
* some impl. methods
LB-873: User managed banner ad on top of the blog - backend
* inser/update with type
Merge branch 'liveblog-15' into lb-873-blog-media
LB-873: User managed banner ad on top of the blog - backend
* adjusted
LB-869: On chained blogs beside the original user name also show his avatar
* starting the icon handling
LB-895: Facebook source is not showing the login with facebook button
* outer-joining fixed
Merge branch 'liveblog-15' into lb-895-join-userless-collabs
LB-894: Twitter is not working because the proxy server is down

Provide sourcefabric cors proxy url.
Merge pull request #284 from petrjasek/lb-894-twitter-cors

Lb 894 twitter cors
Merge branch 'liveblog-15' into lb-869-chained-avatar
Merge pull request #281 from msat-cont/lb-895-join-userless-collabs

LB-895: join userless collabs
LB-860: On Manage Collaborators -> add new collaborators, it is showed only first 20 collaborators.

Fixed.
Merge pull request #285 from eozan/LB-860

Lb 860
NR-989 : Upgrade from Liveblog 1.4 crashes
LB-869: On chained blogs beside the original user name also show his avatar
* some impl