title: pip install hyperopt and hyperas fail
body: <p>I was trying to install hyperopt, but I got the following error:</p>
  
  <pre><code>Collecting hyperopt
  Using cached hyperopt-0.0.2.tar.gz
  Complete output from command python setup.py egg_info:
  DEBUG:root:distribute_setup.py not found, defaulting to system setuptools
  Traceback (most recent call last):
    File "&lt;string&gt;", line 1, in &lt;module&gt;
    File "/tmp/pip-build-gmhldfe7/hyperopt/setup.py", line 119, in &lt;module&gt;
      if package_data is None: package_data = find_package_data(packages)
    File "/tmp/pip-build-gmhldfe7/hyperopt/setup.py", line 102, in find_package_data
      for subdir in find_subdirectories(package):
    File "/tmp/pip-build-gmhldfe7/hyperopt/setup.py", line 73, in find_subdirectories
      subdirectories = os.walk(package_to_path(package)).next()[1]
  AttributeError: 'generator' object has no attribute 'next'
  
  ----------------------------------------
  Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-gmhldfe7/hyperopt/
  </code></pre>
  
  <p>And I got the same error when intalling hyperas. But I can install ggplot successfully by using <code>pip</code> command. I am using Ubuntu 14.04 and Python 3.5. </p>
  
  <p>Thanks. </p>