CreateIssueHandler patch (autoAssign emails to Projects based on email TO: address

With a single email POP server we can make use of catchmail to route such mail to a nominated project. Thats great, now do it for 90 project, 1000 project?

Manually configuring numerous services entries to enable email delivery to the projects is a royal pain.

To fix this, Ive modified the CreateIssueHandler (and I think AbstractMessageHandler, submitted under JRA-14973) to enable a single Handler to automatically lookup the projectkey from the email address, so just ONE entry is required for n projects.

The scenario supporting how this works is setting up a Virtual Mailbox, so all mail to a given domain 'whatever@jira.server.net' ends up in a single mailbox. After this, the to: address just has the domain stripped off and upper cased to check for a project.

Please take this into codebase so I don't have to keep building it!