Merge branch 'xsendfile_complete_zip_fix' of github.com:riso/owncloud-core into riso-xsendfile_complete_zip_fix from pull request #3307

Conflicts:
	lib/helper.php

Add \OC_Appconfig Unittest

Better ie8 multiselect

remove duplicate code

fix minor style issue in the app navigation

Improve app-management

Do not use realpath() on includes.

Conflicts:
	settings/js/apps.js

This is possible because we require PHP 5.3 or higher.

If the file does not exist, realpath() returns false and "include false;"
produces "Failed opening '' for inclusion" which is a useless error message.

'include' works just fine with symlinks, "./" and "../".

Fix some JSLint warnings

Use JSON to send/receive group data.

use strict equals in readdir loops to prevent issues with '0' files

Fix files_external webdav up and download when path contains ' '

Move quota logic from filesystem proxy to storage wrapper

adding file templates for ods, odt and odp

Enable user to decrypt files again after encryption app was disabled

move upload progress bar near upload button, more contextual

Add newlines at the end of files

fixing error page layout