title: Can't run npm install
body: <p>In <a href="http://devdocs.magento.com/guides/v2.0/frontend-dev-guide/css-topics/css_debug.html" rel="nofollow noreferrer">here</a> it says to run <code>npm install</code>, but I get this error when I run <code>sudo npm install</code>.</p>
  
  <pre><code>sudo npm install
  npm WARN enoent ENOENT: no such file or directory, open '/var/www/html/mg/package.json'
  npm WARN mg No description
  npm WARN mg No repository field.
  npm WARN mg No README data
  npm WARN mg No license field.
  </code></pre>
  
  <p>without sudo: </p>
  
  <pre><code>npm install
  npm WARN enoent ENOENT: no such file or directory, open '/var/www/html/mg/package.json'
  npm WARN mg No description
  npm WARN mg No repository field.
  npm WARN mg No README data
  npm WARN mg No license field.
  npm ERR! Linux 4.4.0-59-generic
  npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "install"
  npm ERR! node v4.2.6
  npm ERR! npm  v3.5.2
  npm ERR! path /var/www/html/mg/node_modules/.staging
  npm ERR! code EACCES
  npm ERR! errno -13
  npm ERR! syscall mkdir
  
  npm ERR! Error: EACCES: permission denied, mkdir '/var/www/html/mg/node_modules/.staging'
  npm ERR!     at Error (native)
  npm ERR!  { [Error: EACCES: permission denied, mkdir '/var/www/html/mg/node_modules/.staging']
  npm ERR!   errno: -13,
  npm ERR!   code: 'EACCES',
  npm ERR!   syscall: 'mkdir',
  npm ERR!   path: '/var/www/html/mg/node_modules/.staging' }
  npm ERR! 
  npm ERR! Please try running this command again as root/Administrator.
  
  npm ERR! Please include the following file with any support request:
  npm ERR!     /var/www/html/mg/npm-debug.log
  </code></pre>