It's easier to find errors in the code if an exception is thrown.

OC_VCategories => OC\Tags. Public interface and getter in server container

- get request from the server container
- implement registerMiddleWare()
- adding getAppName() to app container

Conflicts:
	apps/files/lib/helper.php
	apps/files_trashbin/lib/helper.php

Server folder methods

fixing typo

Fix the apps enabling/disabling in settings

clear permissions cache when scanning a file

Typo in comment "feature" => "future"

Conflicts:
	lib/public/iservercontainer.php
	lib/server.php

Add a couple of interface definitions

Fix not displaying "Upload something!" message

Fix #4940

recreate an etag within the scanner if the cache contains an empty etag

Fix preview for shared folder and public upload

Fix Sharing "Expiration Date" for Shares of type Link (i.e. Token)

* owncloud/fix-link-expiration:
  Perform expiration date checking before returning share data for token.
  Tests whether expired/valid link share is still accessible.