added field completion for abstracts

git-svn-id: http://haxe.googlecode.com/svn/trunk@5921 f16182fa-f095-11de-8f43-4547254af6c6
also allow new completion for abstracts

git-svn-id: http://haxe.googlecode.com/svn/trunk@5922 f16182fa-f095-11de-8f43-4547254af6c6