Update to elixir 3.3.1, removed unused elixir.json format bower.json

elixir.json

@@ -1,6 +0,0 @@
-{
-    "bowerDir": "vendor/bower_components",
-    "cssOutput": "public/dist/css",
-    "jsOutput": "public/dist/js",
-    "production": true
-}

gulpfile.js

@@ -1,5 +1,6 @@
 var elixir = require('laravel-elixir');
 
+elixir.config.production = true;
 elixir.config.sourcemaps = false;
 
 elixir(function (mix) {

package.json

@@ -2,7 +2,7 @@
     "dependencies": {
         "bower": "~1.4.1",
         "gulp": "~3.9.0",
-        "laravel-elixir": "~3.1.1",
+        "laravel-elixir": "~3.3.1",
         "laravel-elixir-jshint": "~0.1.7"
     },
     "private": true