Allow any array-like object as buffer - no string checks

[coolaj86]

This could work equally well in the browser and node if a v2.0.0 were released that simply expected an Array-like object as input (Buffer, TypedArray, Array) without any detection or formatting being done by the library itself.

I'd be happy to PR such a version.

[chrisumbel]

i like it

[jimmywarting]

Me too
Beside, the constructor is deprecated since a long time ago.

thirty-two/lib/thirty-two/thirty-two.js

Lines 86 to 89 in 1f9d240

	if(!Buffer.isBuffer(encoded)){
	encoded = new Buffer(encoded);
	}
	var decoded = new Buffer(Math.ceil(encoded.length * 5 / 8));