tree和select-tree中增加属性，可以控制当checkbox存在被禁用时，父级是否应当全选

[fbecky]

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What problem does this feature solve?

当tree中同级节点出现disableCheckbox或者disabled时，父级节点不应当有全选状态。
一个父级节点有2个子节点，子节点其中有一个是禁用checkbox的，当选中另一个子节点时，父节点变更为全选状态。这里逻辑有一些奇异。虽然被禁用，但是父节点不应当时全选状态，应当时半选状态
期望可以有一个属性可以控制这样的逻辑。

What does the proposed API look like?

ignoreNodeDisabled：ture|false 为true时，不考虑子节点的disableCheckbox属性，可选子节点全选后父级全选。
为false时，当子节点存在禁用时，父级不会是全选

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