title: How to remove proguard file from inherit proguardFiles?
body: <p>I have 2 buildTypes below: </p>
  
  <pre><code>debug {
      ...
      proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro', 'proguard-rules-dont-obfuscate.pro'
      ...
  }
  
  inhouse.initWith(buildTypes.debug)
  inhouse {
      ...
      proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
      println proguardFiles.toString()
      ...
  }
  </code></pre>
  
  <p>I want my inhouse buildType inherited from debug (for other properties) but not to include proguard file proguard-rules-dont-obfuscate.pro as seen above. Unfortunately, after printing out the proguardFiles, it still has proguard-rules-dont-obfuscate.pro even though I didn't include it.</p>