migrated from grunt to gulp, jshint to eslint

.eslintrc

@@ -0,0 +1,69 @@
+{
+    "rules": {
+        "no-console": 0,
+        "no-unused-vars": 0,
+        "indent": [
+            2,
+            4
+        ],
+        "semi": [
+            2,
+            "always"
+        ]
+    },
+    "env": {
+        "node": true,
+        "browser": true,
+        "jquery": true,
+        "amd": true
+    },
+    "globals": {
+        "Matter": false,
+        "window": true,
+        "document": false,
+        "Element": false,
+        "MatterTools": false,
+        "phantom": false,
+        "process": false,
+        "HTMLElement": false,
+        "require": false,
+        "PIXI": false,
+        "$": false,
+        "Example": false,
+        "Image": false,
+        "navigator": false,
+        "setTimeout": false,
+        "decomp": false,
+        "module": false,
+        "Body": false,
+        "Composite": false,
+        "World": false,
+        "Contact": false,
+        "Detector": false,
+        "Grid": false,
+        "Pairs": false,
+        "Pair": false,
+        "Resolver": false,
+        "SAT": false,
+        "Constraint": false,
+        "MouseConstraint": false,
+        "Common": false,
+        "Engine": false,
+        "Mouse": false,
+        "Sleeping": false,
+        "Bodies": false,
+        "Composites": false,
+        "Axes": false,
+        "Bounds": false,
+        "Vector": false,
+        "Vertices": false,
+        "Render": false,
+        "RenderPixi": false,
+        "Events": false,
+        "Query": false,
+        "Runner": false,
+        "Svg": false,
+        "Metrics": false
+    },
+    "extends": "eslint:recommended"
+}

.travis.yml

@@ -3,7 +3,7 @@ sudo: false
 node_js:
   - "0.12"
 before_install: 
-  - npm install -g grunt-cli
+  - npm install -g gulp
   - mkdir travis-phantomjs
   - wget https://s3.amazonaws.com/travis-phantomjs/phantomjs-2.0.0-ubuntu-12.04.tar.bz2 -O $PWD/travis-phantomjs/phantomjs-2.0.0-ubuntu-12.04.tar.bz2
   - tar -xvf $PWD/travis-phantomjs/phantomjs-2.0.0-ubuntu-12.04.tar.bz2 -C $PWD/travis-phantomjs

CONTRIBUTING.md

@@ -6,7 +6,7 @@ To build you must first install [node.js](http://nodejs.org/) and [grunt](http:/
 
 This will install the required build dependencies, then run
 
-	grunt dev
+	gulp dev
 
 which is a task that builds the `matter-dev.js` file, spawns a `connect` and `watch` server, then opens `demo/dev.html` in your browser. Any changes you make to the source will automatically rebuild `matter-dev.js` and reload your browser for quick and easy testing.