Signalling an all-electric future is coming our way, Elon Musk-run Tesla has hit the $100 billion in stock market valuation for the first time. Tesla shares were last up 1.4 per cent at $555 after trading was closed on Tuesday, reports CNBC. The milestone came less than a month after Tesla's stock crossed $420 -- a price Musk tweeted last year which put him in much trouble. The $100 billion ...