Merge branch 'components-require-relative' into 'master'

Fix registering npm linked components

See merge request pubsweet/pubsweet!48

packages/server/package.json

@@ -46,6 +46,7 @@
     "prompt": "^1.0.0",
     "pubsweet-sse": "^0.1.4",
     "relational-pouch": "^1.4.5",
+    "require-relative": "^0.8.7",
     "uuid": "^3.0.1",
     "winston": "^2.2.0"
   },

packages/server/src/register-components.js

 const logger = require('@pubsweet/logger')
 const config = require('config')
+const requireRelative = require('require-relative')
 
 module.exports = app => {
   if (config.has('pubsweet.components')) {
     config.get('pubsweet.components').forEach(name => {
-      const component = require(name)
+      const component = requireRelative(name)
       logger.info('Registered component', name)
       const backendComponent = component.server || component.backend
       if (backendComponent) {