Do not publish artifacts on git, only in the npm package

Author: oncletom

dist/.gitignore

@@ -0,0 +1 @@
+*.*

dist/Imager.map.js

@@ -4,10 +4,11 @@
   "description": "Imager.js is an alternative solution to the issue of how to handle responsive image loading, created by developers at BBC News.",
   "main": "Imager.js",
   "scripts": {
-    "test": "npm run test-pre && ./node_modules/karma/bin/karma start",
-    "test-pre": "jshint Imager.js",
-    "test-watch": "./node_modules/karma/bin/karma start --auto-watch --no-single-run",
-    "build": "uglifyjs ./Imager.js -c -m -o ./Imager.min.js --source-map ./Imager.map.js && mv -f Imager.{map,min}.js ./dist"
+    "test": "./node_modules/karma/bin/karma start",
+    "posttest": "jshint Imager.js",
+    "test-watch": "npm test -- --auto-watch --no-single-run",
+    "build": "uglifyjs ./Imager.js -c -m -o ./Imager.min.js --source-map ./Imager.map.js && mv -f Imager.{map,min}.js ./dist",
+    "preversion": "npm run build && npm run test"
   },
   "repository": {
     "type": "git",