Give a binary representation of self Integer

Property definitions

core :: bitset $ Int :: bits
	# Give a binary representation of self Integer
	fun bits: Array[Int]
	do
		var bits = new Array[Int].with_capacity(32)

		for i in [0..32[
		do
			bits[i] = getbit(i)
		end

		return bits
	end
lib/core/bitset.nit:59,2--70,4