[D-runtime] Preparing for beta

[Walter Bright]

I'd like to hold off on merging pull requests until we get the beta released 
(but keep on generating pull requests!), unless those PR's resolve 'regression' 
issues, or 'critical' or 'blocker' issues with non-disruptive changes.

Current list:

http://d.puremagic.com/issues/buglist.cgi?query_format=advanced&bug_severity=regression&bug_severity=blocker&bug_severity=critical&bug_status=NEW&bug_status=ASSIGNED&bug_status=REOPENED&version=D1%20%26%20D2&version=D2