title: Configure gitolite to exclude emails about certain branches
body: <p>I have a server using gitolite with lots of repositories. Right now, it sends an email to a mailing list after every commit. However, there are lots of these emails that really don't need to be generated. For example, we don't need to see if a branch was deleted, or if the branch is <code>*-signedoff</code> (we sign off branches before pushing to master). I'm trying to figure out if gitolite has a way of using a regex to have specific rules, but I can't find anything in the documentation or anyone else on the web who seems to be doing something similar.</p>
  
  <p>Currently, the top level config looks like this:</p>
  
  <pre><code>repo @all
    config hooks.envelopesender = abc@xyz.com
    config hooks.emailprefix    = '[%GL_REPO] '
    config hooks.mailinglist    = abc-commits@xyz.com
    config hooks.emailmaxline   = 10000
    RW+&gt;   = @admins  # Inherited to all repos
    RW&gt;&gt;   = @core  # Inherited to all repos
  </code></pre>
  
  <p>Is it possible to have per-commit rules in gitolite? Would I need to do something with a <code>post-receive</code> git hook?</p>