(Reuters) – Mercedes driver Nico Rosberg escaped unhurt after a high speed blow-out during tyre testing in Bahrain on Thursday. "Just spun at full speed 320km/h on Bahrain straight cause my tyre blew up without warning," the German said in a tweet that was later deleted. "Thanks to that need to get some toilet paper now.." A number of teams are taking part in a three day test with tyre supplier …