title: Build script error, unsupported Gradle DSL method found: 'signingConfig()'
body: <p>I'm trying to setup gradle to create a Google Play store release in Android Studio 0.4.5.  In gradle settings, I am using the default gradle wrapper.  I used the Project Properties dialog to set up the signing config and 'release' build type.  I only have one build module.  Here is the build.gradle file that resulted:</p>
  
  <pre><code>    apply plugin: 'android'
  
  android {
      compileSdkVersion 19
      buildToolsVersion '19.0.1'
      defaultConfig {
          minSdkVersion 15
          targetSdkVersion 19
          versionCode 10
          versionName "1.0"
      }
      buildTypes {
          release {
              runProguard true
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
              debuggable false
              signingConfig playstore
              proguardFile 'proguard-rules.txt'
          }
      }
      signingConfigs {
              playstore {
              keyAlias 'mykeyalias'
              storeFile file('playstore.jks')
              keyPassword 'xxxxx'
              storePassword 'xxxxx'
          }
      }
  }
  
  dependencies {
      compile fileTree(dir: 'libs', include: ['*.jar', '*.aar'])
      compile 'com.android.support:support-v4:+'
      compile files('libs/libGoogleAnalyticsServices.jar')
  }
  </code></pre>
  
  <p>But I am getting the following error when gradle tries to sync:</p>
  
  <pre><code>Build script error, unsupported Gradle DSL method found: 'signingConfig()'!
              Possible causes could be:  
              - you are using Gradle version where the method is absent 
              - you didn't apply Gradle plugin which provides the method
              - or there is a mistake in a build script
  </code></pre>
  
  <p>Is there something I need to do to setup the correct gradle?</p>
  
  <p>Thanx in advance.</p>