Work around Dart2JS bug 11188

BUG=
R=sigmund@google.com

Review URL: https://chromiumcodereview.appspot.com//16599012
v0.4.7+5

BUG=

Review URL: https://chromiumcodereview.appspot.com//16377004
publish - remove generated .js files
Added syntax support for @host

BUG=
R=sigmund@google.com

Review URL: https://chromiumcodereview.appspot.com//18118002
0.4.7+7

BUG=

Review URL: https://chromiumcodereview.appspot.com//18053008
merged