title: Task 'publishApkRelease' not found in root project
body: <p>Im trying to configure <a href="https://github.com/Triple-T/gradle-play-publisher" rel="nofollow">gradle-play-publisher</a>
   in my project, I have configured play block in build.gradle(Module: app), here's my build.gradle(Module:app):</p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  android {
      compileSdkVersion 22
      buildToolsVersion "23.0.0 rc2"
  
      defaultConfig {
          applicationId "com.***.***"
          minSdkVersion 11
          targetSdkVersion 21
  
          ndk {
              moduleName "mupdf"
          }
      }
  
      signingConfigs {
          release {
              storeFile file("./***")
              storePassword "***"
              keyAlias "***"
              keyPassword "***"
          }
      }
  
      buildTypes {
          release {
              minifyEnabled false
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
              signingConfig signingConfigs.release
          }
      }
  
      packagingOptions {
          exclude 'META-INF/LICENSE.txt'
          exclude 'META-INF/NOTICE.txt'
          exclude 'META-INF/LICENSE'
          exclude 'META-INF/NOTICE'
      }
  
      sourceSets.main {
          jniLibs.srcDir 'app/src/main/jniLibs'
          jni.srcDirs = []
      }
  
      lintOptions {
          abortOnError false
      }
  }
  
  apply plugin: 'com.github.triplet.play'
  //apply plugin: 'play'
  
  play {
      serviceAccountEmail = '***@developer.gserviceaccount.com'
      pk12File = file('./***.p12')
  }
  
  dependencies {
      compile 'com.android.support:appcompat-v7:21.0.3'
      compile 'com.google.android.gms:play-services:+'
  }
  </code></pre>
  
  <p>Here's my build.gradle (Project)</p>
  
  <pre><code>buildscript {
      repositories {
          jcenter()
          mavenCentral()
      }
      dependencies {
          classpath 'com.android.tools.build:gradle:1.2.3'
          classpath 'com.github.triplet.gradle:play-publisher:1.1.1'
          classpath 'com.google.guava:guava:18.0'
      }
  }
  
  allprojects {
      repositories {
          jcenter()
      }
  }
  </code></pre>
  
  <p>Im getting following exception on running <code>./gradlew publishApkRelease --stacktrace</code> :</p>
  
  <pre><code>    * Exception is:
      org.gradle.execution.TaskSelectionException: Task 'publishApkRelease' not found in root project '***'.
          at org.gradle.execution.TaskSelector.getSelection(TaskSelector.java:101)
          at org.gradle.execution.TaskSelector.getSelection(TaskSelector.java:76)
          at 
  ...
          at org.gradle.launcher.bootstrap.ProcessBootstrap.run(ProcessBootstrap.java:35)
          at org.gradle.launcher.GradleMain.main(GradleMain.java:23)
          at org.gradle.wrapper.BootstrapMainStarter.start(BootstrapMainStarter.java:33)
          at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:130)
          at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:48)
  </code></pre>
  
  <p>How to fix it? </p>