title: Detect if Cordova plugin exists
body: <p>Is there a way to tell if a specific Cordova plugin is available to be called in Cordova 2.5.0? <code>Cordova.exec</code> takes in a <code>successFunction</code> and a <code>failFunction</code> but the <code>failFunction</code> is only called if the native code executes. Is there a way to receive an error or callback if the receiving function doesn't exist? I'm looking for a solution that works with a remove URL loaded into WebView</p>
  
  <p><a href="http://docs.phonegap.com/en/2.5.0/guide_plugin-development_ios_index.md.html" rel="noreferrer">http://docs.phonegap.com/en/2.5.0/guide_plugin-development_ios_index.md.html</a></p>