Fix imagerotate and move loadFromBase64() one up.

imagerotate() with third parameter being -1 does not seem to work in PHP 5.5

loadFromBase64() one up, so debug-logs aren't spammed (as much) with urlencoded
base64-data from loadFromFile() debug output.
Add displayname for admins
Return 101 if user doesnt exist
adding share owner information to the file list
store the share owner in a data-attribute instead of a separate span
update share owner
remove duplicate selectors and declaration
show share owner within shared folders as well
uppercase text and fix dialog popup
Improve jQuery element selector

see https://github.com/owncloud/core/pull/7012/files#r9337198
http://24ways.org/2011/your-jquery-now-with-less-suck/
Use 'command -v' to detect whether and where software is installed (instead of 'which')
Allow admins to disable certain external storages for users

Fix issue #6793
Cache the fileinfo in OC\Preview
Merge branch 'master' into display-share-owner-master

Conflicts:
	apps/files_sharing/lib/cache.php
replace spaces in download link without encoding entire URL
move replace to inside isset
Update 3rdparty submodule
Replace OC.Router.generate() with OC.generateUrl()
adding JSDoc + remove unused function
fixing download url in files app