title: Command not found when trying to run a nodeschool lesson
body: <p>I'm not sure if this is purposeful but when running the...</p>
  
  <pre><code>npm install learnyounode -g
  </code></pre>
  
  <p>..command in terminal, the module is being created in my home directory. When I try to run the 'learnyounode' command from the directory that I run the npm install from I get the message 'command not found'. I've looked in the usr directory but the learnyounode directory is not in there.</p>
  
  <p>After everything intalls I get the following output </p>
  
  <pre><code>/Users/username/npm/bin/learnyounode -&gt; /Users/username/npm/lib/node_modules/learnyounode/learnyounode.js
  learnyounode@0.4.1 /Users/username/npm/lib/node_modules/learnyounode
  ├── duplexer@0.1.1
  ├── through@2.3.4
  ├── boganipsum@0.1.0
  ├── hyperquest@0.1.8 (through@2.2.7)
  ├── concat-stream@1.2.1 (bops@0.0.6)
  ├── bl@0.6.0 (readable-stream@1.0.26)
  ├── through2-map@1.2.1 (through2@0.2.3, terminus@1.0.9)
  └── workshopper@0.7.2 (map-async@0.1.1, tuple-stream@0.0.2, split@0.2.10, mkdirp@0.3.5,     xtend@2.1.2, colors-tmpl@0.1.0, terminal-menu@0.2.0, optimist@0.6.1, msee@0.1.1)
  </code></pre>
  
  <p>ps. I have a fresh install of node in my usr folder. I am more concerned that this problem is going to happen when I want to install other packages via NPM in the future.</p>