title: Android: Attribute 'rippleColor' has already been defined
body: <p>My Android application had no problems with this build.gradle file.</p>
  
  <pre><code>apply plugin: 'com.android.application'
  apply plugin: 'com.google.gms.google-services'
  
  android {
      compileSdkVersion 23
      buildToolsVersion "23.0.1"
  
      defaultConfig {
          applicationId "com.marshall.opensurvey"
          minSdkVersion 15
          targetSdkVersion 23
          versionCode 1
          versionName "1.0"
      }
      buildTypes {
          release {
              minifyEnabled false
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
          }
      }
  }
  
  repositories {
      jcenter()
  }
  
  dependencies {
      compile fileTree(dir: 'libs', include: ['*.jar'])
      testCompile 'junit:junit:4.12'
      compile 'com.android.support:appcompat-v7:23.1.0'
      compile 'com.android.support:design:23.1.0'
      compile 'com.android.support:support-annotations:23.1.0'
      compile 'com.android.support:support-v4:23.1.0'
      compile 'com.android.support:support-v13:23.1.0'
      compile 'com.squareup.okhttp:okhttp:2.0.0'
  
      // Material Drawer Library by Mike Penz
      compile('com.mikepenz:materialdrawer:4.3.9@aar') {
          transitive = true
      }
      // Android Iconics Library by Mike Penz
      compile 'com.mikepenz:iconics-core:1.7.9@aar'
      compile 'com.mikepenz:google-material-typeface:1.2.0.1@aar'
      // Google Analytics Library
      compile 'com.google.android.gms:play-services-analytics:8.1.0'
      // Circle Image View Library
      compile 'de.hdodenhof:circleimageview:2.0.0'
      // Flat Button Library
      compile 'info.hoang8f:fbutton:1.0.5'
      // Process Button Library
      compile 'com.github.dmytrodanylyk.android-process-button:library:1.0.4'
      // Fancy Button Library
      compile 'com.github.medyo:fancybuttons:1.5@aar'
  
      // Card View and Recycler View Library
      compile 'com.android.support:cardview-v7:23.1.0'
      compile 'com.android.support:recyclerview-v7:23.1.0'
  }
  </code></pre>
  
  <p>But, as I added another dependency in the build.gradle file and synced, it started to show an error, saying that the attribute 'rippleColor' has already been defined. The new dependency I put in the gradle file is this.</p>
  
  <pre><code>// Material Design Library
  compile 'com.github.navasmdc:MaterialDesign:1.5@aar'
  </code></pre>
  
  <p>I assume that this error is shown because the newly added one contains an attribute which has the same name that is already defined in the previously added libraries. What should I modify in this file so that the third-party libraries do not crash each other?</p>