s = Stock.new "goog"
1.9.3 (main)> s.get_historical_quotes(1)
  => [
    [0] [
      [0] "2013-11-25",
      [1] "1037.16",
      [2] "1053.19",
      [3] "1035.02",
      [4] "1045.93",
      [5] "1613000",
      [6] "1045.93"
    ]
  ]
  
1.9.3 (main)> s.bollinger_bands
  => [
    [ 0] {
            :sma => 1026,
          :lower => 1007.2383369607063,
          :upper => 1044.7616630392938,
      :bandwidth => 0.036572442571722714,
      :percent_b => 1.0063517013445724
    },
    [ 1] {
            :sma => 1024,
          :lower => 1006.6794919243113,
          :upper => 1041.3205080756888,
      :bandwidth => 0.03382911733532967,
      :percent_b => 0.7020725942163671
    },
    ...