Add a command to generate reference screenshot images

Author: peterhry

README.hbs

@@ -30,9 +30,10 @@ import CircleType from `circletype`;
 
 ## Development Commands
 
-| Command            | Description                   |
-|:-------------------|:------------------------------|
-| `npm run dev`      | Start dev server              |
-| `npm start`        | Build for release             |
-| `npm test`         | Run unit and screenshot tests |
-| `npm run docs`     | Generate documentation        |
+| Command                 | Description                       |
+|:------------------------|:----------------------------------|
+| `npm run dev`           | Start dev server                  |
+| `npm start`             | Build for release                 |
+| `npm test`              | Run unit and screenshot tests     |
+| `npm run docs`          | Generate documentation            |
+| `npm run reference`     | Generate reference screenshots    |

README.md

@@ -162,9 +162,10 @@ circleType.destroy();
 
 ## Development Commands
 
-| Command            | Description                   |
-|:-------------------|:------------------------------|
-| `npm run dev`      | Start dev server              |
-| `npm start`        | Build for release             |
-| `npm test`         | Run unit and screenshot tests |
-| `npm run docs`     | Generate documentation        |
+| Command                 | Description                       |
+|:------------------------|:----------------------------------|
+| `npm run dev`           | Start dev server                  |
+| `npm start`             | Build for release                 |
+| `npm test`              | Run unit and screenshot tests     |
+| `npm run docs`          | Generate documentation            |
+| `npm run reference`     | Generate reference screenshots    |

package.json

@@ -10,8 +10,10 @@
   "scripts": {
     "dev": "webpack-dev-server --open",
     "start": "eslint src && npm t && npm run docs && webpack -p",
-    "test": "jest src --notify && docker run -w /usr/data -v \"$PWD\":/usr/data tenjaa/java-chrome-nodejs npm run backstop",
-    "backstop": "backstop test",
+    "test": "jest src --notify && docker run -w /usr/data -v \"$PWD\":/usr/data tenjaa/java-chrome-nodejs npm run backstop-test",
+    "reference": "docker run -w /usr/data -v \"$PWD\":/usr/data tenjaa/java-chrome-nodejs npm run backstop-reference",
+    "backstop-test": "backstop test",
+    "backstop-reference": "backstop reference",
     "docs": "jsdoc2md --template README.hbs --files src/class.js > README.md"
   },
   "keywords": [