Merge branch 'release' into 'master'

Release v1.0.0.

See merge request !130

package.json

 {
   "name": "pubsweet-server",
-  "version": "1.0.0-beta.3",
+  "version": "1.0.0",
   "scripts": {
     "lint": "eslint src/ test/ config/",
     "test": "jest",