Optimization, EMA addition, Clarification:

 - Clarify and cleanup indicator summaries - Move to README.md
 - indicators: Optimize sqlite hits, we were running MakeCandlePriceList
   once for every indicator in a single candle.
 - Introduce EMA, use a hack in trader to trade it as expected in a
   crossover (convergence) indicator.
 - We should never trade on bid/ask triggers, rather below/above
   (does however vary on indicator)