2018-04-22, Version 3.4.0

Upgrading to 3.4.x versions requires that you upgrade to 3.2.0 version first.
Eventum 3.4.x requires PHP 5.6.

NOTE: Mail related Workflow methods changed signature, see #263

• Use Doctrine as ORM for SCM and IssueAssociation (@glensc, #307)
• Support multiple selections in search fields (@inguin, #323)
• Add EventDispatcher events for SCM actions (@glensc, #328)
• Gracefully deal with commits from unknown SCM repositories (@inguin, #327)
• Make LDAP user ID attribute configurable, add help page (@inguin, #329)
• Drop pear/mime_decode, pear/mail_mime in favor of Zend\Mail (@glensc, #263, #333, #334, #335)
• Use symfony/filesystem for file writes (@glensc, #331)
• Add EventDispatcher to console commands (@glensc, #337)
• Mail-Download: fix user_id fetch using email header (@glensc, #336)
• Added support for "checkbox" custom fields on advanced search page (@balsdorf, #347)
• Mail Queue: set message status failed after 20 retries (@glensc, #353)
• Mail Queue: fill Message-Id column (@glensc, #352)
• Mail Queue: Fix empty from header check (@glensc, #350, #351)
• Use filename-normalizer for attachment filenames extracted from emails (@glensc, #356)
• Fix Open Redirect vulnerability found by NetSparker (https://www.netsparker.com/, @balsdorf)
• Add experimental markdown rendering (@glensc, #291)
• Update to defuse/php-encryption 2.1 (@glensc, #358)