By Ahmed Aboulenein and Lin Noueihed CAIRO (Reuters) - Islamic State's official magazine carried a photo on Wednesday of a Schweppes drink it said was used to make an improvised bomb that brought down a Russian airliner over Egypt's Sinai Peninsula last month, killing all 224 people on board. The photo showed a can of Schweppes Gold soft drink and what appeared to be a detonator and switch on a blue background, three simple components that if genuine are likely to cause concern for airline safety officials worldwide. ...