Added new Strategy RSI_EMACrossover

[eater]

Thank you TCMabe!

When I try to backtest this I get the following error and no result:

  Error: non-error thrown:
  This Gekko instance encountered an error and can't continue
      at Object.onerror (C:\gekko-stable\node_modules\koa\lib\context.js:105:40)
      at <anonymous>
      at process._tickCallback (internal/process/next_tick.js:188:7)

I have not had any problem with backtesting others strategies such as RSIBearBull, but I do have problems importing data.

Best Regards,
eater