0.4.5.0
Update trunk to version 0.4.5.0 (cut at r20992)

svn merge -r 20748:20992 https://dart.googlecode.com/svn/branches/bleeding_edge trunk

git-svn-id: http://dart.googlecode.com/svn/trunk@20995 260f80e4-7a28-3924-810f-c04153c831b5