0.5.20.1
Version 0.5.20.1

svn merge -r 24103:24104 https://dart.googlecode.com/svn/branches/bleeding_edge trunk
svn merge -r 24144:24145 https://dart.googlecode.com/svn/branches/bleeding_edge trunk
svn merge -r 24149:24150 https://dart.googlecode.com/svn/branches/bleeding_edge trunk

git-svn-id: http://dart.googlecode.com/svn/trunk@24151 260f80e4-7a28-3924-810f-c04153c831b5