mobile: smaller images for smaller screens, fit 2 to width
Pictures: make header scroll away on mobile
Pictures: fix 'Picture view' button position
Pictures: change notice to 'shared by username' as in Files
Pictures: change 'Picture view' and 'File list' toggles to icons
fix missing file extension
Merge pull request #1607 from owncloud/mobile-style

Mobile style for public links: files, folders, picture sets
[tx-robot] updated from transifex
Fix loading single shared images
Show single shared images in the same view as shared albums
Don't show shared images mixed with the users images
Fix creating thumbnails for images on external storages
[tx-robot] updated from transifex
[tx-robot] updated from transifex
[tx-robot] updated from transifex
Don't create new thumbnails on the write hook
[tx-robot] updated from transifex
Implement request #301: Create users when using external auth login

After a successful login with imap, smb or ftp, the corresponding
user is created in an own database table.
This is needed to make e.g. sharing files with this users work.

The table may be used by several different external user authentication
services.

See the discussion in https://github.com/owncloud/apps/pull/1579
for details on the implementation design.
Fix code according to blizzz' notes
remove superfluous class path definition