title: Bundle install fails when install unf_ext. "Cannot allocate memory error when installing unf_ext"
body: <p>I have this bug that happens on my remote server.</p>
  
  <p>Though this isn't replicable in my local environment.</p>
  
  <p>Installing unf_ext 0.0.7.2 with native extensions</p>
  
  <p>Gem::Ext::BuildError: ERROR: Failed to build gem native extension.</p>
  
  <pre><code>/home/ubuntu/.rbenv/versions/2.1.2/bin/ruby extconf.rb
  </code></pre>
  
  <p>Cannot allocate memory - /home/ubuntu/.rbenv/versions/2.1.2/bin/ruby extconf.rb 2>&amp;1</p>
  
  <pre><code>Gem files will remain installed in /home/ubuntu/switch-web/shared/bundle/ruby/2.1.0/gems/unf_ext-0.0.7.2 for inspection.
  Results logged to /home/ubuntu/switch-web/shared/bundle/ruby/2.1.0/extensions/x86_64-linux/2.1.0-static/unf_ext-0.0.7.2/gem_make.out
  An error occurred while installing unf_ext (0.0.7.2), and Bundler cannot
  continue.
  Make sure that `gem install unf_ext -v '0.0.7.2'` succeeds before bundling.
  </code></pre>
  
  <p>I've checked the ram space for my  server and it's still pretty decent (2gb free).</p>