title: Qt Creator, build dir with branch name
body: <p>Based on several kits I am using, the Qt Creator build directory is derived from</p>
  
  <ul>
  <li>project name</li>
  <li>Qt version</li>
  <li>compiler</li>
  <li>build configuration: debug / release</li>
  </ul>
  
  <p>Example: <code>build-client-Qt_5_3_0_fooProject_MINGW_32bit_qmake_MinGW22-Debug</code></p>
  
  <p>My problem is, if I switch my git branch, I always have to recompile from scratch (time consuming). I wonder, if it might be possible to include the branch name, so I can keep different builds at the same time</p>
  
  <p>=> Possible build dirs:</p>
  
  <ul>
  <li><code>build-client-Qt_5_3_0_fooProject_MINGW_32bit_qmake_MinGW22-Debug_master</code></li>
  <li><code>build-client-Qt_5_3_0_fooProject_MINGW_32bit_qmake_MinGW22-Debug_branchbar</code></li>
  </ul>
  
  <p>Or is there a chance to add a third build configuration, e.g. <code>Debug_others</code>, resulting in a build directory such as</p>
  
  <p><code>build-client-Qt_5_3_0_fooProject_MINGW_32bit_qmake_MinGW22-Debug_others</code></p>