title: PyCharm and NLTK: code completion (autocomplete) doesn't work
body: <p>I use PyCharm.
  I have installed PySide and NLTK via PIP. Both PySide and NLTK work well.</p>
  
  <p>The code completion in PyCharm works for PySide well. The code completion works for NLTK objects, but it offered no NLTK methods. It shows only private methods like "update", "dir", "doc", "str" with underscores.</p>
  
  <p>In the Python 3.4.0 Shell IDLE works code completion for NLTK well. 
  In the PyDev (Eclipse) works code completion for NLTK well.</p>
  
  <p>Windows 7 64 Bit, PyCharm 3.0.1 Pro and now 3.4.1 Pro, Python 3.4.0, NLTK 3.0.0</p>
  
  <p>Any ideas?</p>
  
  <p><img src="https://i.stack.imgur.com/t2lV2.jpg" alt="no code completion for NLTK">
  <img src="https://i.stack.imgur.com/4pXWb.jpg" alt="package NLTK is installed">
  <img src="https://i.stack.imgur.com/RgWX8.jpg" alt="paths">
  <img src="https://i.stack.imgur.com/kGlo1.jpg" alt="code completion works in Python 3.4.0 Shell IDLE well">
  <img src="https://i.stack.imgur.com/BOBac.jpg" alt="code completion works in PyDev"></p>