title: Reference is not a tree: f0a7...3e8c during cocoapods install
body: <p>After creating a new project in Xcode, I added</p>
  
  <pre><code>pod 'Typhoon', :head
  </code></pre>
  
  <p>to my Podfile. When trying to install the pod, I get the following error:</p>
  
  <pre><code>MacbookPro:MyNewProject myuser$ pod install
  Analyzing dependencies
  Downloading dependencies
  Installing Typhoon (HEAD based on 2.2.1)
  [!] /usr/bin/git submodule update --init --depth 1
  
  Submodule 'Source/Vendor/OCLogTemplate' (https://github.com/typhoon-framework/OCLogTemplate.git) registered for path 'Source/Vendor/OCLogTemplate'
  Cloning into 'Source/Vendor/OCLogTemplate'...
  
  fatal: reference is not a tree: f0a76376a6b13b014b2785f54f106b84ebc83e8c
  
  Unable to checkout 'f0a76376a6b13b014b2785f54f106b84ebc83e8c' in submodule path 'Source/Vendor/OCLogTemplate'
  </code></pre>
  
  <p>The cocoapods version is:</p>
  
  <pre><code>MacbookPro:MyNewProject myuser$ pod --version
  0.34.0
  </code></pre>
  
  <p>Any ideas how to fix this?</p>