update the xml parser to convert NaN to 0.0f when parsing cfls, have asset server throw 403's when the animation data is bad, not 500's from trying to json encode it.
update the xml parser to convert NaN to 0.0f when parsing cfls, have asset server throw 403's when the animation data is bad, not 500's from trying to json encode it.

git-svn-id: febc42a3fd39fb08e5ae2b2182bc5ab0a583559c@197073 07c76cb3-cb09-0410-85de-c24d39f1912e

imvu/cal3d,imvu/cal3d,imvu/cal3d,imvu/cal3d