title: How to add indeterminate progressbar
body: <p>My applications UI is built using the Android Support Library, but there is currently no AppCompat version of the (intederminate) progressbar, which my app really needs.</p>
  
  <p>I would prefer to not use any third party libraries to achieve material design progressbars, so I'm wondering if anyone sits on information about why it's not included in the support library, and if there is any sign of it arriving (and when).</p>