title: Can't get CtrlP to set working dir as root folder
body: <p>Im working on project that is in fact composed of several subproject, under a common git repository:</p>
  
  <pre><code>Project
     - Sub Project A
     - Sub Project B
     - ...
  </code></pre>
  
  <p>I never work on the main folder, and always start from one of the sub projects, the problem is no matter what I try CtrlP always does the search starting from the main folder where the repo is.</p>
  
  <p>I've tried a few settings from the project repo but no matter, such as bellow, but still can't get it to make any effect.</p>
  
  <p><code>let g:ctrlp_working_path_mode = 'ca'</code></p>
  
  <p>Any tips please?</p>