title: NLTK importError when using Porter Stemmer
body: <p>I am importing nltk, but it gives the following error. </p>
  
  <pre><code>Traceback (most recent call last):
    File "/home/control/Work/Intelligence/Datasets/whats cooking/new.py", line 4, in &lt;module&gt;
      import nltk
    File "/usr/local/lib/python2.7/dist-packages/nltk-3.0.5-py2.7.egg/nltk/__init__.py", line 137, in &lt;module&gt;
      from nltk.stem import *
    File "/usr/local/lib/python2.7/dist-packages/nltk-3.0.5-py2.7.egg/nltk/stem/__init__.py", line 29, in &lt;module&gt;
      from nltk.stem.snowball import SnowballStemmer
    File "/usr/local/lib/python2.7/dist-packages/nltk-3.0.5-py2.7.egg/nltk/stem/snowball.py", line 25, in &lt;module&gt;
      from nltk.stem import porter
  ImportError: cannot import name porter
  </code></pre>
  
  <p>My nltk was working perfectly a few days ago and i haven't updated or changed anything and I've also installed all the nltk data.</p>