title: Get SPList and SharePoint.Client.List web relative url
body: <p>I am working with sharepoint list and sharepoint client list objects. Is there any way to get web relative urls of those objects?
  I know about ServerRelativeUrl, DefaultViewUrl but they don't solve my problem.
  I want exactly web relative urls, without view url parts.
  For example my tasks list has a url like this</p>
  
  <pre><code>http://example.com/sites/developer/lists/tasks/CustomDefaultView.aspx
  </code></pre>
  
  <p>and i want only <code>lists/tasks</code> part. 
  For example my shared documents has a url like this</p>
  
  <pre><code>http://example.com/sites/developer/shared%20documents/Forms/AllItems.aspx
  </code></pre>
  
  <p>and i want only <code>shared%20documents</code> part. 
  I need this both for SPList class and for SharePoint.Client.List class
  thanks!</p>