adding OC-ETag header
Ensure db connection before changing cache state

When trying to upgrade from 7.0.0 to 7.0.2, the manual upgrade path
(e.g. ` sudo -u www-data /usr/bin/php5 ./occ upgrade`) exits with the
following fatal error:

```
/var/www/owncloud# php occ upgrade
PHP Fatal error:  Call to a member function
  disableQueryStatementCaching() on a non-object in
  /var/www/owncloud/lib/private/db.php on line 423
```

This is caused by the self::$connection static variable having not
been initialized at the point of call. Adding a self::connect() fixes
the issue.

See https://forum.owncloud.org/viewtopic.php?f=29&t=23398&p=68556#p68556
Fixed readme for acceptance tests
also style submit buttons
Merge pull request #10807 from owncloud/acceptance-readme

Fixed readme for acceptance tests
Don't automatically setup the filesystem the moment we load OC\Files\FileSystem
Remove unneeded file initialization in encryption, already handled in a hook
Also setup the filesystem when matching routes
Merge pull request #10697 from owncloud/fs-no-autosetup

Don't automatically setup the filesystem the moment we load OC\Files\Filesystem
Merge pull request #10816 from owncloud/app-nav-submit

Also style submit buttons for navigation inputs
[tx-robot] updated from transifex
Merge pull request #10725 from owncloud/sabredav-etag-master

adding OC-ETag header
Merge pull request #10761 from canadaduane/fix_occ_upgrade

Ensure db connection before changing cache state