TINY-926, Schema: there's no reason why isValidChild should be case-sensitive
TINY-926, Schema: there's no reason why isValidChild should be case-sensitive

tinymce/tinymce,adaptiffdesigns/tinymce,danielpunkass/tinymce,gencer/tinymce,adaptiffdesigns/tinymce,TeamupCom/tinymce,tinymce/tinymce,FernCreek/tinymce,FernCreek/tinymce,leofeyer/tinymce,danielpunkass/tinymce,MediehusetTek/tinymce,tinymce/tinymce,leofeyer/tinymce,gencer/tinymce,MediehusetTek/tinymce,FernCreek/tinymce,danielpunkass/tinymce,TeamupCom/tinymce