Add AltMarkets.io Exchange support to Markets

[TheHolyRoger]

This PR adds AltMarkets.io exchange support to markets in Iquidus Explorer.

Visibly working here:
https://explorer.theholyroger.com/markets/altmarkets

[cryptozeny]

i will test it in near future

[TheHolyRoger]

Sorry for another force push but wanted to keep commit clean. Final tweaks to add BTC/exchange volume and 24h change %

Edit: Ah bloody git! That's it now, final force push below. All seems to be working for me.

[cryptozeny]

  "markets": {
    "coin": "SUGAR",
    "exchange": "BTC",
    "enabled": ["altmarkets"],
    "cryptopia_id": "1658",
    "ccex_key" : "Get-Your-Own-Key",
    "default": "altmarkets"
  },

[cryptozeny]

its working

$ npm start # term-1

> explorer@1.6.1 start /home/ak/git/SUGAR/EXPLORER/explorer
> node --stack-size=10000 ./bin/cluster

Starting cluster with pid: 16569
no richlist entry found, creating now..
no stats entry found, creating now..
no altmarkets entry found, creating now..
no stats entry found, creating now..
no stats entry found, creating now..
no altmarkets entry found, creating now..
no altmarkets entry found, creating now..
initial richlist entry created for Sugarchain
initial stats entry created for Sugarchain
initial stats entry created for Sugarchain
initial stats entry created for Sugarchain
initial markets entry created for altmarkets
initial markets entry created for altmarkets
initial markets entry created for altmarkets

$ node scripts/sync.js market
script launched with pid: 16844
altmarkets market data updated successfully.

[cryptozeny]

ef8af68 Tested ACK