Add backward compatibility code for :email_addresses #33
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Redmine in Debian stable does not support multiple email addresses yet. So, to support Debian stable's version of Redmine the plugin needs to check if the
:email_addresses
association is available for User.The changes is made in the way, so the plugin will work under both versions of Redmine - on old Debian stable's one (2.5.2.devel, which is almost 3.0) and new 3.x ones. I.e. the style of the fix resembles #14.