Adjust for Elixir move to npm

Gulpfile.js

-var elixir = require('./vendor/laravel/elixir/Elixir');
+var elixir = require('laravel-elixir');
 
 /*
  |----------------------------------------------------------------

composer.json

@@ -5,8 +5,7 @@
 	"license": "MIT",
 	"type": "project",
 	"require": {
-		"laravel/framework": "~5.0",
-		"laravel/elixir": "~1.0"
+		"laravel/framework": "~5.0"
 	},
 	"require-dev": {
 		"phpunit/phpunit": "~4.0"

package.json

 {
-  "private": true,
     "devDependencies": {
-    "del": "^0.1.3",
         "gulp": "^3.8.8",
-    "gulp-autoprefixer": "^1.0.1",
-    "gulp-coffee": "^2.2.0",
-    "gulp-concat": "^2.4.1",
-    "gulp-less": "^1.3.6",
-    "gulp-load-plugins": "^0.7.0",
-    "gulp-minify-css": "^0.3.10",
-    "gulp-notify": "^1.8.0",
-    "gulp-phpspec": "^0.3.0",
-    "gulp-phpunit": "^0.6.3",
-    "gulp-rev": "^1.1.0",
-    "gulp-sass": "^1.1.0",
-    "gulp-shell": "^0.2.9",
-    "gulp-uglify": "^1.0.1",
-    "gulp-if": "^1.2.5",
-    "gulp-util": "^3.0.1",
-    "install": "^0.1.7",
-    "npm": "^2.1.2",
-    "require-dir": "^0.1.0",
-    "underscore": "^1.7.0"
+        "laravel-elixir": "^0.3.5"
     }
 }