title: How can I get ack to ignore *.orig files?
body: <p>I put this in my .ackrc:</p>
  
  <pre><code>--type-set=DUMB=*.orig
  --noDUMB
  </code></pre>
  
  <p>... but I'm still seeing files like main.py.orig in my ack results. I tried doing <code>--type-set=DUMB=*.*.orig</code> too, but that didn't work either.</p>
  
  <p><strong>More info</strong></p>
  
  <p>Run from my command line (OSX Snow Leopard with :</p>
  
  <pre><code>timmfin at lorien in ~/dev/performable/rafa on landing-pages-csv-and-more!
  ± ack modules --python | grep '.orig'
  src/rafa/main.py.orig:25:import rafa.ui.modules.helpers
  src/rafa/main.py.orig:26:from rafa.ui.modules.performable_form import PerformableForm
  src/rafa/main.py.orig:27:from rafa.ui.modules.page_form import PageEditForm
  src/rafa/main.py.orig:28:from rafa.ui.modules.settings_form import SettingsForm
  ....
  
  timmfin at lorien in ~/dev/performable/rafa on landing-pages-csv-and-more!
  ± cat ~/.ackrc 
  --color
  --sort-files
  --smart-case
  
  --type-set=sass=.sass
  --type-set=coffee=.coffee
  
  --ignore-dir=rafa/static
  --ignore-dir=compiled
  --ignore-dir=compressed
  
  --ignore-dir=venv
  --ignore-dir=build
  
  timmfin at lorien in ~/dev/performable/rafa on landing-pages-csv-and-more!
  ± ack --version
  ack 1.94
  Running under Perl 5.10.0 at /usr/bin/perl
  </code></pre>