Make DirectoryIterator case insensitive (#2932)
Make DirectoryIterator case insensitive (#2932)

* make DirectoryIterator case insensitive

* Also need to make filename case insensitive while appending it into self.filenames

keras-team/keras,kemaswill/keras,dolaameng/keras,kuza55/keras,DeepGnosis/keras,relh/keras,keras-team/keras,nebw/keras