Use jq instead of jsonlint

As the jsonlint package from NPM causes problems and looks unmaintained,
it'll be replaced with `jq` a well maintained project which allows to
search through JSON files in a `grep`-like style, but knowing the JSON
structure.

Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>

.travis.yml

@@ -32,7 +32,10 @@ jobs:
         - diff -q README.md README.md.orig
       language: generic
     - env: task=json-lint
-      install: npm install jsonlint
+      addons:
+        apt:
+          packages:
+          - jq
       script:
         - npm run jsonlint
       language: generic

package.json

@@ -6,7 +6,7 @@
   "license": "AGPL-3.0",
   "scripts": {
     "test": "npm run-script standard && npm run-script jsonlint",
-    "jsonlint": "find . -not -path './node_modules/*' -type f -name '*.json' | while read json; do echo $json ; jsonlint -q $json; done",
+    "jsonlint": "find . -not -path './node_modules/*' -type f -name '*.json' | while read json; do echo $json ; jq . $json; done",
     "standard": "node ./node_modules/standard/bin/cmd.js",
     "dev": "webpack --config webpack.config.js --progress --colors --watch",
     "build": "webpack --config webpack.production.js --progress --colors --bail",