Add support to change hint text appearance programmatically

[davidbilik]

Since we want to use this programmatically its akward to create HintTextAppearance in the XML styles. I would like to change hint text size, hint color and also typeface(?) progrmamatically and not through XML .. I know that its probably problematic because this hintTextAppearance is passed to some other object as the whole but I would like to explore possibilities we have.