title: Isn't a Gem::Specification error after trying to install thumbshooter as a gem
body: <p>Every time I run rake or bundle I am now getting this error message:</p>
  
  <pre><code>.rvm/gems/ruby-1.9.2-p290/specifications/thumbshooter-0.1.5.gemspec] isn't a Gem::Specification (NilClass instead).
  </code></pre>
  
  <p>This started happening after I tried installing thumbshooter as a gem. </p>
  
  <p>I tried to uninstall the gem, but that doesn't seem to have any effect. Also thumbshooter doesn't seem to be installed anyway.</p>