Tesla stock hasn't closed above $700 since May. Nicolas Asfouri/AFP via Getty Images Tesla stock looks like it is breaking out, with a hefty gain despite a lack of substantial news. The likeliest reason is developments in China . Shares have been on a tear. Last week, despite a 2% decline after the electric-car company reported its earnings on Tuesday, Tesla (ticker: TSLA) shares rose 6.8% from $643.38, closing the week at $687.20. The results were better than expected, with the company setting new records for operating profit and bottom-line income, so that news may have helped the stock even...