Fix authors in composer.json
Merge pull request #8 from finwe/mh-composer-author-fix

Fix authors in composer.json
Some improvements of webdav client
Fixed possible notice in \Jyxo\Mail\Parser
\Jyxo\Beholder\TestCase\Memcached can use memcached extension
Added \Jyxo\Beholder\TestCase\Redis
Improved \Jyxo\Beholder\TestCase\Webdav
Fixed \Jyxo\Beholder\TestCase\Redis
WebDAV methods copy and rename create directories
From header is required in \Jyxo\Beholder\TestCase\Smtp
Support for group tax id in \Jyxo\Input\Validator\IsTaxId