title: MultiDexApplication not recognized
body: <p>Trying to use MultiDexApplication in my app, but the class is not recognized when I try to extend my application activity with it.</p>
  
  <p>Here is my build.gradle file:</p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  android {
      compileSdkVersion 21
      buildToolsVersion '21.0.1'
      defaultConfig {
          applicationId 'com.myapp'
          minSdkVersion 10
          targetSdkVersion 21
          versionCode 115
          versionName '4.8'
      }
  
      buildTypes {
          debug {
              debuggable true
              runProguard false
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
          }
          release {
              debuggable false
              runProguard true
              zipAlign true
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
          }
      }
  
      packagingOptions {
          exclude 'META-INF/LICENSE.txt'
          exclude 'META-INF/NOTICE.txt'
      }
  
      lintOptions {
          checkReleaseBuilds false
      }
  }
  
  dependencies {
      compile fileTree(dir: 'libs', include: ['*.jar'])
  
      compile 'com.google.android.gms:play-services:6.1.11'
  
      compile 'com.android.support:appcompat-v7:21.0.0'
  
      compile 'com.nineoldandroids:library:2.4.0'
      compile 'com.viewpagerindicator:library:2.4.1@aar'
      compile project(':facebook')
  }
  </code></pre>
  
  <p>You can see that I'm compiling on 21, using the latest build tools, and the latest google play services and support library.</p>
  
  <p>Has anyone gotten this to work?</p>