title: Reference Specific Commit in a Repo Without Podspec
body: <p>With <code>cocoapods</code> I'd like to reference a specific commit (without tag) for a repo which does <em>not</em> have a Podspec file - namely <code>SBJSON</code>. How can I specify this? I tried:</p>
  
  <pre><code>pod 'SBJson', :podspec =&gt; 'https://raw.github.com/CocoaPods/Specs/master/SBJson/3.1/SBJson.podspec', :git =&gt; 'https://github.com/stig/json-framework.git', :commit =&gt; '5c4d5f7'
  </code></pre>
  
  <p>But I cannot both provide <code>:podspec</code> <em>and</em> <code>:git</code> with <code>:commit</code>. What can I do? Do I have to provide my own local <code>Podspec</code> file for this to work?</p>