mail-client/roundcube: Fix Multiple Vulnerabilities

mail-client/roundcube: Fix Multiple Vulnerabilities

Many security issues/enhancements are resolved with this release. The
most significant being:

* Fix (again) security issue in DBMail driver of password plugin (CVE-2015-2181)
* Fix path traversal vulnerability in setting a skin (CVE-2015-8770)
* Fix XSS issue in SVG images handling
* Fix XSS issue in href attribute on area tag

You can find the complete list of changes in the included CHANGELOG or at:
https://github.com/roundcube/roundcubemail/wiki/Changelog

Bug: 580746, 584200, 584098

Package-Manager: portage-2.2.26