Pass through define values.  Add class_attribute define. Add @:include with no args to imply default include. gen_externs for DllExport

git-svn-id: http://haxe.googlecode.com/svn/trunk@6132 f16182fa-f095-11de-8f43-4547254af6c6
php: improved field access with keyword

git-svn-id: http://haxe.googlecode.com/svn/trunk@6133 f16182fa-f095-11de-8f43-4547254af6c6