title: node-linkedin coonection issue
body: <p>I'm having an issue when trying to implement an exemple of connexion with node-linkedin.</p>
  
  <p>I always get this error: <code>{ errorCode: 0, message: 'Invalid access token.', requestId: 'IN32C163DK', status: 401, timestamp: 1459554255669 }</code></p>
  
  <p>Here my code:</p>
  
  <pre><code>var nodemailer = require('nodemailer');
  
  var Linkedin = require('node-linkedin')('app-id', 'secret', 'callback');
  
  router.get('/linkedin', function(req, res) {
  console.log("hello linkedin");
  var linkedin = Linkedin.init('my_access_token');
  linkedin.companies_search.name('facebook', 1, function(err, company) {
  console.log(company);
  name = company.companies.values[0].name;
  desc = company.companies.values[0].description;
  industry = company.companies.values[0].industries.values[0].name;
  city = company.companies.values[0].locations.values[0].address.city;
  websiteUrl = company.companies.values[0].websiteUrl;
  });
  });
  </code></pre>
  
  <p>Here the link of package: <a href="https://github.com/ArkeologeN/node-linkedin" rel="nofollow">https://github.com/ArkeologeN/node-linkedin</a></p>
  
  <p>Can you help me on that please?</p>
  
  <p>Thanks</p>