Migrate plugins to lib directory

lib/plugins/ticker/bitstamp/bitstamp.js

@@ -0,0 +1,26 @@
+const BN = require('../../../bn')
+const common = require('../common/bitstamp')
+
+function ticker (account, fiatCode, cryptoCode) {
+  return Promise.resolve()
+  .then(() => {
+    if (cryptoCode !== 'BTC') {
+      throw new Error('Unsupported crypto: ' + cryptoCode)
+    }
+  })
+  .then(() => {
+    const market = common.buildMarket(fiatCode, cryptoCode)
+    return common.request('/ticker/' + market, 'GET')
+  })
+  .then(r => ({
+    rates: {
+      ask: BN(r.ask),
+      bid: BN(r.bid)
+    }
+  }))
+}
+
+module.exports = {
+  ticker
+}
+