Add dependency checks to pre-commit and travis

.travis.yml

@@ -1,28 +1,24 @@
 sudo: false
 language: node_js
-cache:
-  directories:
-    - node_modules
 notifications:
   email: false
 node_js:
   - 4
   - 6
 matrix:
-    fast_finish: true
-    allow_failures:
+  fast_finish: true
 env:
   global:
     - CXX=g++-4.8
-script: "npm run travis"
+script: npm run travis
 addons:
   apt:
     sources:
       - ubuntu-toolchain-r-test
     packages:
       - g++-4.8
 before_install:
-  - npm i -g npm@^2.0.0
+  - npm i -g npm@^3.0.0
 before_script:
   - npm prune
 after_success:

package.json

@@ -9,10 +9,11 @@
   "scripts": {
     "lint": "jshint .",
     "test": "npm run units",
-    "travis": "npm test",
+    "travis": "npm run check-dependencies && npm test",
     "units": "node test/run.js | tap-spec",
     "validate": "npm ls",
-    "semantic-release": "semantic-release pre && npm publish && semantic-release post"
+    "semantic-release": "semantic-release pre && npm publish && semantic-release post",
+    "check-dependencies": "node_modules/.bin/npm-check --production"
   },
   "repository": {
     "type": "git",
@@ -36,15 +37,17 @@
     "mergeable": "0.0.0"
   },
   "devDependencies": {
-    "tape": "^4.5.0",
-    "tap-spec": "^4.1.1",
-    "precommit-hook": "^3.0.0",
     "jshint": "^2.9.4",
-    "semantic-release": "^6.3.2"
+    "npm-check": "^5.4.0",
+    "precommit-hook": "^3.0.0",
+    "semantic-release": "^6.3.2",
+    "tap-spec": "^4.1.1",
+    "tape": "^4.5.0"
   },
   "pre-commit": [
     "lint",
     "validate",
-    "test"
+    "test",
+    "check-dependencies"
   ]
 }