Remove inline variable, allow inline forms

Basically you should always use the 'horizontal' variable now, not inline. If you want inline then do `horizontal => false`. Also changed the default label class to remove the 'control-label' class as it is not used on inline forms, only horizontal. 


This works really well for me now, I can do

    array(
        'horizontal' => false,
        'label_render' => false,
    );

And get a full width widget which is exactly what I need. I don't think this should really break much else.. Collection should still be fine.