* Move Application to correct namespace and PSR-4 it

* Move dav app to PSR-4

* Move Encryption to PSR-4

* Move encryption tests to PSR-4

* Fix the tests

Opening a permalink that points to a trashed file will now display the
file within the "Deleted Files" section in the files web UI.

Fixes the redirection after login, otherwise `core/files/index` is opened which fails.

* Move app to PSR-4

* Fix setUp method

* Fix the tests

* allow configuration of memcache options

Use production values for memcached as explained in http://apprize.info/php/scaling/15.html

The current implementiation uses ascii based serialization. This PR should reduce traffic to the memcached server.

cc @MorrisJobke @FelixBoehm

* add config sample

* merge config options, throw hint on config error

* fix typo

* fix config sample

Fix etag propegation test race condition

E-tag propagation replies on the mtime of the file. Order of events:

1. add file 'foo.txt' with content 'bar'
2. Set mtime to now() - 1
3. Check if etag changed.

Now this goes right often when 1 and 2 happen in the same second.
However imagine

1. add file 'foo.txt' with content 'bar' (at t=0.999)
2. Set mtime to now() - 1 (at t=1.001)

Now the mtime will be set to the same time. Thus not chaning the etag.

Correctly register PSR-4 autoloading before install.php and loading commands

Pluggable auth

add some range to time() assertions

add token type column and delete only temporary tokens in the background job

debounce token updates; fix wrong class import

* Update last_activity timestamp of the session token
* Check user backend credentials once in 5 minutes

add 'last_activity' column to session tokens and delete old ones via a background job

* Add InvalidTokenException
* add DefaultTokenMapper and use it to check if a auth token exists
* create new token for the browser session if none exists
hash stored token; save user agent
* encrypt login password when creating the token

Move \OCP\Command to PSR-4