title: RestKit: change base URL of RKObjectManager
body: <p>Is it possible to change base URL of <code>RKObjectManager</code> after creation?</p>
  
  <p>I have login box and from nickname I decide which URL for API I should use. If I create <code>RKObjectManager</code> after filling nick/password, I can make only single call from RestKit ( <a href="https://groups.google.com/forum/?fromgroups#!topic/restkit/wFNhpCW-URA" rel="noreferrer">https://groups.google.com/forum/?fromgroups#!topic/restkit/wFNhpCW-URA</a> ). If I create <code>RKObjectManager</code> <code>viewDidLoad</code> function - I cannot change URL.</p>
  
  <p>Is there same solution to my problem?</p>
  
  <p>Thanks.</p>