title: Error: cannot find module 'mime'
body: <p>I am trying to install cartodb on ubuntu 12.04. I have done all the steps mentioned on <a href="https://github.com/danseely/cartodb-install/blob/master/DEV-INSTALLATION.md" rel="noreferrer">https://github.com/danseely/cartodb-install/blob/master/DEV-INSTALLATION.md</a> and I am stuck at the Install Windshaft-cartodb Step. The following steps worked fine:</p>
  
  <pre><code>cd ~
  git clone git://github.com/CartoDB/Windshaft-cartodb.git
  cd Windshaft-cartodb
  git checkout master
  npm install
  cp config/environments/development.js.example   config/environments/development.js
  </code></pre>
  
  <p>Whenever I hit the command node app.js development, it gives me following error:</p>
  
  <pre><code>module.js:340
  throw err;
        ^
  Error: Cannot find module 'mime'
   at Function.Module._resolveFilename (module.js:338:15)
   at Function.Module._load (module.js:280:25)
   at Module.require (module.js:364:17)
   at require (module.js:380:17)
   at Object.&lt;anonymous&gt; (/home/user/Windshaft- cartodb/node_modules/windshaft/node_modules/grainstore/node_modules/millstone/lib/millstone.js:6:12)
   at Module._compile (module.js:456:26)
   at Object.Module._extensions..js (module.js:474:10)
   at Module.load (module.js:356:32)
   at Function.Module._load (module.js:312:12)
   at Module.require (module.js:364:17)
   at require (module.js:380:17)
  </code></pre>
  
  <p>I installed mapnik using </p>
  
  <pre><code>sudo add-apt-repository ppa:mapnik/v2.2.0
  sudo apt-get update
  sudo apt-get install libmapnik libmapnik-dev mapnik-utils python-mapnik
  </code></pre>