title: html5lib cannot be found in bleach installation
body: <p>I'm installing tensorflow-gpu on centos6.5(python3.5) which requires tensor-board which requires bleach==1.5.0 which requires:</p>
  
  <pre><code>Collecting html5lib!=0.9999,!=0.99999,&lt;0.99999999,&gt;=0.999 (from bleach==1.5.0)
  </code></pre>
  
  <p>so I installed html5lib 0.9999999(7 nines) from source:</p>
  
  <pre><code>python setup.py install
  </code></pre>
  
  <p>And I verified the installation by import html5lib in python:</p>
  
  <pre><code>Python 3.5.0 (default, Sep 10 2017, 00:16:28) 
  [GCC 4.4.7 20120313 (Red Hat 4.4.7-4)] on linux
  Type "help", "copyright", "credits" or "license" for more information.
  &gt;&gt;&gt; import html5lib
  &gt;&gt;&gt; 
  </code></pre>
  
  <p>seems successful.
  Then I tried to install bleach1.5.0:</p>
  
  <pre><code>$ sudo pip install bleach-1.5.0-py2.py3-none-any.whl  
  Processing ./bleach-1.5.0-py2.py3-none-any.whl
  Collecting html5lib!=0.9999,!=0.99999,&lt;0.99999999,&gt;=0.999 (from 
  bleach==1.5.0)
  </code></pre>
  
  <p>And error occured :</p>
  
  <pre><code>Could not find a version that satisfies the requirement 
  html5lib!=0.9999,!=0.99999,&lt;0.99999999,&gt;=0.999 (from bleach==1.5.0) (from 
  versions: )
  No matching distribution found for html5lib!=0.9999,!=0.99999,
  &lt;0.99999999,&gt;=0.999 (from bleach==1.5.0)
  </code></pre>
  
  <p>For some reason the installing computer has no network connection. So I download the required whl files and tar.gz from another computer and upload it to the installing computer.
  I also tried html5lib 0.999, which didn't work either and report the same error.
  I refered this one<a href="https://stackoverflow.com/questions/17258003/cant-open-html5lib-in-python">enter link description here</a>, and ensure that six 1.10.0 has been installed.</p>