Rework indicators + Fast StochasticK Osc:

  - Rework SMA to support better external calling (will be useful with
    Stochastic %D style oscillators and more)
  - Run all indicators all the time, still only trade off one (see TODO)
  - Add a Fast StochasticK Oscillator
  - Rename StochRSI to StochRSIK as a preface to a StochRSID
    implementation
  - README: No longer planning on implementing indicators in sqlite
    tables. This is unnecesary since we now have persist capable
    price_list. The only indicator calculations which don't currently
    additionally persist are RS avg_gain and avg_loss calculations. This
    can be worked around in the future with a simple for/while set for
    the period when it exists, and not be done in real time two price
    pairs at a time (like current).