center utils

RGB -> HSL

Use provided mimetype on open. Fix #4696

Ocs cleanup

Allow Windows (or Linux) users to specify OpenSSL options in the ownCloud config

This should help make OpenSSL configuration on Windows servers easier by allowing the openssl.cnf file to be set directly in the ownCloud config, rather than in SetEnv commands that don't exist and are hard to replicate in IIS.

remove the activity call here. it is not implemented anyways. 

fix issues caused by introduction of sticky Apps management footer

Files controls fixes

Fit filesummary for \OC\Preview's new mimetype-icons

centers text message in empty-content page (files and files_trashbin apps) 

Fix #4258 and improve unittest

Conflicts:
	lib/image.php

remove the activity call here. it is not implemented anyways. This will be provided by Activity app in the future.

\OC\Preview

Move CSS for apps and browser-specific fixes out of main styles.css