title: Why does conda try to update packages with --no-update-dependencies?
body: <p>Often when I try to install a new package, conda wants to update other packages as well, even though I have added the --no-update-dependencies switch. The updates seem to be "unnecessary" - like most of the time only the last part of the version number has changed.</p>
  
  <p>Today I wanted to install the mpld3 package and conda wants to update my python package from version 3.4.4-2 to 3.4.4-4, even though I have added the --no-update-dependencies switch.</p>
  
  <p>How can I make conda install the mpld3 package without touching my other packages?</p>
  
  <pre><code>C:\...&gt;conda install -p pyenv --no-update-dependencies mpld3
  Fetching package metadata: ....
  Solving package specifications: ...........
  
  Package plan for installation in environment C:\...\pyenv:
  
  The following packages will be downloaded:
  
      package                    |            build
      ---------------------------|-----------------
      vs2010_runtime-10.00.40219.1|                0         1.1 MB
      python-3.4.4               |                4        31.7 MB
      mpld3-0.2                  |           py34_0         123 KB
      ------------------------------------------------------------
                                             Total:        33.0 MB
  
  The following NEW packages will be INSTALLED:
  
      mpld3:          0.2-py34_0
      vs2010_runtime: 10.00.40219.1-0
  
  The following packages will be UPDATED:
  
      python:         3.4.4-2 --&gt; 3.4.4-4
  
  Proceed ([y]/n)?
  </code></pre>