title: EPPlus missing dependency
body: <p>I added EPPlus and usage of OfficeOpenXml to my project.
  However, when I run my project I get this errors and warning :</p>
  
  <p>Warning :</p>
  
  <pre><code>The referenced assembly "EPPlus" could not be resolved because it has a dependency on "System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" which is not in the currently targeted framework ".NETFramework,Version=v4.0,Profile=Client". Please remove references to assemblies not in the targeted framework or consider retargeting your project.
  </code></pre>
  
  <p>Errors :</p>
  
  <pre><code>The type or namespace name 'OfficeOpenXml' could not be found (are you missing a using directive or an assembly reference?)
  The type or namespace name 'ExcelPackage' could not be found (are you missing a using directive or an assembly reference?)
  </code></pre>
  
  <p>Can someone help me figure it out?</p>