title: Add ViewPagerIndicator to Android Studio
body: <p>i'm trying to get Jake Wharton's ViewPagerIndicator working with Android Studio but unfortunately it won't work. <br>
  I downloaded the .aar file from <a href="https://bintray.com/populov/maven/com.viewpagerindicator%3alibrary" rel="noreferrer">here</a> and included it in my libs folder. <br>
  I referenced it like this: <br></p>
  
  <pre><code>compile files('src/main/libs/viewpagerindicator_2.4.1.aar')
  </code></pre>
  
  <p>Android Studio gives me the following error:</p>
  
  <pre><code>Error:duplicate files during packaging of APK
  </code></pre>
  
  <p>I'm not very familiar with gradle and don't know what to do when it gives me this error. <br>
  Can you please help me with this one? <br></p>
  
  <p>Here's my complete build.gradle: <br></p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  android {
      compileSdkVersion 19
      buildToolsVersion "20.0.0"
  
      defaultConfig {
          applicationId "de.xxx"
          minSdkVersion 15
          targetSdkVersion 19
          compileOptions {
              sourceCompatibility JavaVersion.VERSION_1_7
              targetCompatibility JavaVersion.VERSION_1_7
          }
      }
  
      buildTypes {
       release {
       runProguard false
       proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
      }
      }
  }
  
  dependencies {
      compile 'com.android.support:support-v4:20.0.0'
      compile 'com.github.amlcurran.showcaseview:library:5.0.0'
      compile files('src/main/libs/PdfViewer.jar')
      compile files('src/main/libs/viewpagerindicator_2.4.1.aar')
  }
  </code></pre>