Refactored some exchange code

lib/plugins/exchange/itbit.js

@@ -0,0 +1,22 @@
+const common = require('../common/ccxt')
+const _ = require('lodash/fp')
+const consts = require('./consts')
+const ORDER_TYPE = consts.ORDER_TYPES.LIMIT
+const FIAT = common.FIAT['kraken']
+const CRYPTO = common.CRYPTO['kraken']
+
+const loadConfig = (account) => {
+  const mapper = {
+    'clientKey': 'apiKey',
+    'clientSecret': 'secret',
+    'userId': 'uid'
+  }
+  const mapped = _.mapKeys(key => mapper[key] ? mapper[key] : key)(_.omit(['walletId'], account))
+  return { ...mapped, timeout: 3000 }
+}
+const loadOptions = ({ walletId }) => ({ walletId })
+const isConfigValid = ({ clientKey, clientSecret, userId, walletId }) => clientKey && clientSecret && userId && walletId
+
+const amountPrecision = () => 4
+
+module.exports = { amountPrecision, loadOptions, loadConfig, isConfigValid, CRYPTO, FIAT, ORDER_TYPE }