使用方法：
添加默认分割线：高度为2px，颜色为灰色
1 mRecyclerView.addItemDecoration(new RecyclerViewDivider(mContext, LinearLayoutManager.VERTICAL));
添加自定义分割线：可自定义分割线drawable
1 mRecyclerView.addItemDecoration(new RecyclerViewDivider(
2 mContext, LinearLayoutManager.VERTICAL, R.drawable.divider_mileage));
添加自定义分割线：可自定义分割线高度和颜色
1 mRecyclerView.addItemDecoration(new RecyclerViewDivider(
2 mContext, LinearLayoutManager.VERTICAL, 10, ContextCompat.getColor(mContext, R.color.divide_gray_color)));
万能分割线登场：
