title: FeatherActivity is not being initiallzed with Aviary-SDK (NoClassDefFoundError)
body: <p>The thing is that I want to implement Aviary-SDK in order to have this activity that edit pictures.</p>
  
  <p>The thing is that the project doesn't show any mistake but while launching it I find this error:</p>
  
  <p>10-25 11:05:05.082: E/AndroidRuntime(21217): java.lang.NoClassDefFoundError: com.aviary.android.feather.FeatherActivity</p>
  
  <p>I am sure this is a thing of libraries because I have already done it in a test, but while implementing it in the main project I am having this problem.</p>
  
  <p><img src="https://i.stack.imgur.com/FP5tI.png" alt="Library aviary sdk"></p>
  
  <p><img src="https://i.stack.imgur.com/WqAPo.png" alt="enter image description here"></p>
  
  <p>Thank you very much</p>