Merge branch 'release' into 'master'

 Release v1.0.0. 

See merge request !116

package.json

 {
   "name": "pubsweet",
-  "version": "1.0.0-beta.6",
+  "version": "1.0.0",
   "description": "Pubsweet command-line interface, app generator and manager",
   "bin": "./bin/pubsweet.js",
   "scripts": {