Added Steem and SBD support for price chart.

Just made a simple addition to include Steem and the Steem Dollar by default in the JS crypto price chart.

More currencies and chart information will be added in the near future. I have some new features in the works!

index.html - changes.

    "LTC": {"shortName": "LTC", "longName": "Litecoin", "showLeft": true, "compareTo": ["USDT", "BTC", "XMR"]},
    "ETC": {"shortName": "ETC", "longName": "Ethereum Classic", "showLeft": true, "compareTo": ["USDT", "BTC", "ETH"]},
    "DASH": {"shortName": "DASH", "longName": "Dash", "showLeft": true, "compareTo": ["USDT", "BTC", "XMR"]},
 -  "XMR": {"shortName": "XMR", "longName": "Monero", "showLeft": true, "compareTo": ["USDT", "BTC"]}
 +  "XMR": {"shortName": "XMR", "longName": "Monero", "showLeft": true, "compareTo": ["USDT", "BTC"]},
 +  "Steem": {"shortName": "STEEM", "longName": "Steem", "showLeft": true, "compareTo": ["USDT", "BTC", "XMR"]},
 +  "SBD": {"shortName": "SBD", "longName": "Steem Dollars", "showLeft": true, "compareTo": ["USDT", "BTC"]}
  };
  var ranges = {
    "2d": 2,