replace custom release scripts in favour of np (#55)

* replace custom release scripts in favour of np

* lint only on node versions > 4

.npmrc

@@ -0,0 +1 @@
+message = "Version %s"

.travis.yml

@@ -15,5 +15,4 @@ before_script:
   - "npm install mocha@$MOCHA_VERSION"
 
 script:
-  - if [ "${TRAVIS_NODE_VERSION}" != "0.12" ]; then npm run lint; fi
   - npm run test

package.json

@@ -15,8 +15,11 @@
     "clean-lib": "del-cli \"lib/**\" \"!lib\" \"!lib/reporters\" \"!lib/utils.js\" \"!lib/reporters/base.js\"",
     "clean-tmp": "del-cli \".tmp/**\"",
     "build": "npm run clean-lib && babel ./src -d lib",
-    "lint": "eslint src test bin",
-    "test": "npm run clean-tmp && npm run build && mocha --timeout 10000 --recursive --require test/setup.js \"test/**/*.test.js\""
+    "lint": "node-version-gte-4 && eslint src test bin || echo Node version too old to run linting",
+    "test": "npm run clean-tmp && npm run build && mocha --timeout 10000 --recursive --require test/setup.js \"test/**/*.test.js\"",
+    "posttest": "npm run lint",
+    "prepublish": "npm run build",
+    "release": "np"
   },
   "repository": {
     "type": "git",
@@ -49,6 +52,8 @@
     "eslint-config-airbnb-base": "^4.0.2",
     "eslint-plugin-import": "^1.11.0",
     "mocha": "^3.0.0",
+    "node-version-check": "^2.1.1",
+    "np": "^2.9.0",
     "sinon": "^1.17.3",
     "webpack": "^1.12.13"
   },