title: gradle build fails on lint task
body: <p>I have a simple android project that I created with Android Studio 0.4.0. 
  I use Gradle 1.9 and Gradle Android Plugin 0.7. Yesterday I've added Jake Wharton's <a href="https://github.com/JakeWharton/butterknife">ButterKnife library</a> in my gradle build script:</p>
  
  <pre><code>dependencies {
              compile 'com.android.support:support-v4:19.0.0'
              compile 'com.android.support:appcompat-v7:19.0.0'
  
              // Butterknife
              compile 'com.jakewharton:butterknife:4.0.1'
  }
  </code></pre>
  
  <p>When I run the application from Android Studio, the build runs fine and executes correctly on my devices. But when I try (from the command line) <code>gradle build</code> the build fails. Here is a part from my lint report:</p>
  
  <pre><code>InvalidPackage: Package not included in Android
  
  /home/yami/.gradle/caches/modules-2/files-2.1/com.jakewharton/butterknife/4.0.1/f43b36925363701633d01adb8e54df7150397a78/butterknife-4.0.1.jar: Invalid package reference in library; not included in Android: javax.annotation.processing. Referenced from butterknife.internal.InjectViewProcessor.
  /home/yami/.gradle/caches/modules-2/files-2.1/com.jakewharton/butterknife/4.0.1/f43b36925363701633d01adb8e54df7150397a78/butterknife-4.0.1.jar: Invalid package reference in library; not included in Android: javax.annotation.processing. Referenced from butterknife.internal.InjectViewProcessor.
  /home/yami/.gradle/caches/modules-2/files-2.1/com.jakewharton/butterknife/4.0.1/f43b36925363701633d01adb8e54df7150397a78/butterknife-4.0.1.jar: Invalid package reference in library; not included in Android: javax.annotation.processing. Referenced from butterknife.internal.InjectViewProcessor.
  /home/yami/.gradle/caches/modules-2/files-2.1/com.jakewharton/butterknife/4.0.1/f43b36925363701633d01adb8e54df7150397a78/butterknife-4.0.1.jar: Invalid package reference in library; not included in Android: javax.annotation.processing. Referenced from butterknife.internal.InjectViewProcessor.
  /home/yami/.gradle/caches/modules-2/files-2.1/com.jakewharton/butterknife/4.0.1/f43b36925363701633d01adb8e54df7150397a78/butterknife-4.0.1.jar: Invalid package reference in library; not included in Android: javax.annotation.processing. Referenced from butterknife.internal.InjectViewProcessor.
  </code></pre>
  
  <p>Maybe I'm missing something, but not to be able to build the project in the terminal blocks the possibility of CI for Android projects.</p>
  
  <p>Any help would be great.</p>