title: I receive error for 'import com.firebase.client.Firebase;' on Android
body: <p>I am working on a project using <code>Firebase</code>, but after updating the versions, I receive an error for <code>'import com.firebase.client.Firebase;'</code>.</p>
  
  <p>I cleaned the project, rebuilt, and deleted from local and imported from <code>github</code> where I stored the information.</p>
  
  <p>Here is my <code>build.gradle</code></p>
  
  <pre><code>buildscript {
      repositories {
          jcenter()
      }
      dependencies {
          classpath 'com.android.tools.build:gradle:3.0.0'
          // NOTE: Do not place your application dependencies here; they belong
          // in the individual module build.gradle files
          classpath 'com.google.gms:google-services:3.1.0'
      }
  }
  
  allprojects {
      repositories {
          jcenter()
          maven {url 'https://jitpack.io'}
          maven {url 'https://maven.google.com'}
      }
  }
  
  task clean(type: Delete) {
      delete rootProject.buildDir
  }
  </code></pre>
  
  <p>and here is my <code>build.gradle</code>(Module:app)</p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  android {
      compileSdkVersion 26
      buildToolsVersion '26.0.2'
      defaultConfig {
          applicationId "com.example.android"
          minSdkVersion 19
          targetSdkVersion 26
          versionCode 1
          versionName "1.0"
          testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
      }
      buildTypes {
          release {
              minifyEnabled false
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
          }
      }
      packagingOptions {
          exclude 'META-INF/LICENSE'
          exclude 'META-INF/LICENSE-FIREBASE.txt'
          exclude 'META-INF/NOTICE'
      }
  }
  
  dependencies {
      compile fileTree(dir: 'libs', include: ['*.jar'])
      androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
          exclude group: 'com.android.support', module: 'support-annotations'
      })
  
      compile 'com.android.support:appcompat-v7:26.+'
      compile 'com.android.support.constraint:constraint-layout:1.0.2'
      compile 'com.android.support:design:26.0.0-alpha1'
      compile 'com.android.support:support-v4:26.0.0-alpha1'
      compile 'com.android.support:recyclerview-v7:26.0.0-alpha1'
      compile 'com.android.support:cardview-v7:26.0.0-alpha1'
  
      compile 'com.google.android.gms:play-services-maps:11.0.4'
      compile 'com.google.maps.android:android-maps-utils:0.4.+'
      compile 'com.google.firebase:firebase-core:11.0.4'
      compile 'com.google.firebase:firebase-database:11.0.4'
      compile 'com.google.firebase:firebase-auth:11.0.4'
      compile 'com.google.firebase:firebase-storage:11.0.4'
  
      compile 'com.google.code.gson:gson:2.2.4'
      compile 'com.google.zxing:core:3.2.1'
      compile 'de.hdodenhof:circleimageview:2.1.0'
      compile 'com.github.wdullaer:MaterialDateTimePicker:v3.0.0'
      compile 'com.journeyapps:zxing-android-embedded:3.2.0@aar'
      testCompile 'junit:junit:4.12'
  }
  
  apply plugin: 'com.google.gms.google-services'
  </code></pre>
  
  <p>here is an error I have</p>
  
  <p>screenshot of error</p>
  
  <p><img src="https://i.stack.imgur.com/ZVSmc.png" alt="image"></p>