Method sort

src/animate/Keyframes.js:93–105

()

	}

	sort() {
		const cloneObj = {};
		const keys = Utils.keys(this.keyframes);
		keys.sort((a, b) => parseFloat(a) - parseFloat(b));

		for (let i = 0, len = keys.length; i < len; i++) {
			let k = keys[i];
			cloneObj[k] = this.keyframes[k];
		}

		this.keyframes = cloneObj;
		return this.keyframes;
	}

	merge() {
		const obj = {};