title: Issues downloading Graphlab dependencies get_dependencies()
body: <p>I am having trouble when I try to download the dependencies needed to run <code>graphlab</code>. I do <code>import graphlab</code> I get the following:</p>
  
  <pre><code>ACTION REQUIRED: Dependencies libstdc++-6.dll and libgcc_s_seh-1.dll not found.
  
  1. Ensure user account has write permission to C:\Users\DANISUAR\AppData\Local\Continuum\Miniconda2\envs\gl-env\lib\site-packages\graphlab
  2. Run graphlab.get_dependencies() to download and install them.
  3. Restart Python and import graphlab again.
  
  By running the above function, you agree to the following licenses.
  
  * libstdc++: https://gcc.gnu.org/onlinedocs/libstdc++/manual/license.html
  * xz: http://git.tukaani.org/?p=xz.git;a=blob;f=COPYING
  </code></pre>
  
  <p>So I try to run <code>graphlab.get_dependencies()</code> and I get the following error:</p>
  
  <pre><code>In [2]: gl.get_dependencies()
  
  By running this function, you agree to the following licenses.
  
  * libstdc++: https://gcc.gnu.org/onlinedocs/libstdc++/manual/license.html
  * xz: http://git.tukaani.org/?p=xz.git;a=blob;f=COPYING
  
  Downloading xz.
  Extracting xz.
  Downloading gcc-libs.
  Extracting gcc-libs.
  xz: c:\users\danisuar\appdata\local\temp\tmpcdpyzp.xz: File format not recognized
  ---------------------------------------------------------------------------
  CalledProcessError                        Traceback (most recent call last)
  &lt;ipython-input-2-5349b2d86a08&gt; in &lt;module&gt;()
  ----&gt; 1 gl.get_dependencies()
  
  C:\Users\DANISUAR\AppData\Local\Continuum\Miniconda2\envs\gl-env\lib\site-packag
  es\graphlab\dependencies.pyc in get_dependencies()
   45     prev_cwd = os.getcwd()
   46     os.chdir(dllarchive_dir)
  ---&gt; 47     subprocess.check_call([xz, '-d', dllarchive_file])
   48     dllarchive_tar = tarfile.open(os.path.splitext(dllarchive_file)[0])
   49     dllarchive_tar.extractall()
  
  C:\Users\DANISUAR\AppData\Local\Continuum\Miniconda2\envs\gl-env\lib\subprocess.pyc in check_call(*popenargs, **kwargs)
  539         if cmd is None:
  540             cmd = popenargs[0]
  --&gt; 541         raise CalledProcessError(retcode, cmd)
  542     return 0
  543
  
  CalledProcessError: Command '['c:\\users\\danisuar\\appdata\\local\\temp\\tmpf1habd\\bin_x86-64\\xz.exe', '-d', 'c:\\users\\danisuar\\appdata\\local\\temp\\tmpcdpyzp.xz']' returned non-zero exit status 1
  </code></pre>
  
  <p>I am using an Anaconda environment with Python 2.7 and Windows 7.</p>