Migrate plugins to lib directory

lib/plugin-helper.js

@@ -0,0 +1,23 @@
+const _ = require('lodash/fp')
+
+module.exports = {
+  load,
+  TICKER: 'ticker',
+  EXCHANGE: 'exchange',
+  WALLET: 'wallet',
+  SMS: 'sms',
+  EMAIL: 'email'
+}
+
+function load (type, pluginCode) {
+  const me = module.exports
+  if (!_.includes(type, [me.TICKER, me.EXCHANGE, me.WALLET, me.SMS, me.EMAIL])) {
+    throw new Error(`Unallowed plugin type: ${type}`)
+  }
+
+  if (pluginCode.search(/[a-z0-9\-]/) === -1) {
+    throw new Error(`Unallowed plugin name: ${pluginCode}`)
+  }
+
+  return require(`./plugins/${type}/${pluginCode}/${pluginCode}`)
+}