Merge branch 'system_preferences' of github.com:takeit/Newscoop into plugins_dashboard
update vendors - clean
update vendors - clean, fix
add private_plugins directory to repo
add upgrade command (revert plugins to composer after composer.json/lock files update)
Merge branch 'master' of github.com:sourcefabric/Newscoop into plugins_dashboard
CS-4863: Makes issue repository function more generic

The getLatestByPublication was too specific and also didn't take languages
into account. Now it's more generic and accepts an array as parameters,
where keys should be fields.
Merge pull request #450 from m038/CS-4863

CS-4863: Makes issue repository function more generic
Removes the fetchTimeStamp() because it causes issues. Implements fetch() as it should be implemented. Implements the writeCachedContent() to modify save()
Merge pull request #453 from terwey/CS-4867

Fixes for Caching
Implements populateTimestamp() to allow fetch() to have an extra parameter ()
Merge pull request #454 from terwey/CS-4867

Implements populateTimestamp
Merge pull request #441 from ahilles107/plugins_dashboard

Plugins dashboard
Merge branch 'master' of github.com:sourcefabric/Newscoop into stablemaster
add article types
Merge branch 'master' of github.com:sourcefabric/Newscoop into api_article_types

Conflicts:
	newscoop/library/Newscoop/Entity/ArticleType.php
fix some sc
fix redeclaration
Merge pull request #456 from ahilles107/api_article_types

Api article types
add option to select all images from article, improve ataching multiple images to slideshow