title: get error when import deepchem
body: <p>I used anaconda4.2.0+python3.5.3 environment.</p>
  
  <p>And install deepchem in a new conda environment using the conda commands in scripts/install_deepchem_conda.sh.</p>
  
  <p>however when I run.</p>
  
  <pre><code>import deepchem as dp.
  </code></pre>
  
  <p>the error pops up.</p>
  
  <pre><code>ImportError: dlopen(/Users/Jackie/anaconda/envs/deepchem/lib/python3.5/site-packages/rdkit/Chem/rdmolops.so, 2): Library not loaded: /opt/X11/lib/libXrender.1.dylib
  </code></pre>
  
  <p>How to solve this error?</p>