title: application release version couldn't install on marshmallow code
body: <p>When i use <code>./gradlew assembleDebug</code> and generate debug version of application it's install correctly but when i use <code>./gradlew assembleRelease</code> and generate release version app couldn't be install in android v.6 "Marshmallow".whats wrong with this?  this my <code>gradle.build</code> file.</p>
  
  <pre><code>buildscript {
      repositories {
          maven { url 'https://maven.fabric.io/public' }
  
      }
  
      dependencies {
          classpath 'io.fabric.tools:gradle:1.+'
      }
  }
  apply plugin: 'com.android.application'
  apply plugin: 'io.fabric'
  
  android {
      compileSdkVersion 24
      buildToolsVersion '24.0.1'
  
      signingConfigs {
          config {
              keyAlias 'eCommerce Social Network'
              keyPassword '*****************'
              storeFile file('/home/saeed/Keys/ShareIno/sharino.jks')
              storePassword '!@#$s@EED 13710554$#@!'
          }
      }
  
      defaultConfig {
          applicationId "com.shareino.android"
          minSdkVersion 15
          targetSdkVersion 23
          versionCode 1
          versionName "1.0"
      }
      buildTypes {
          release {
              minifyEnabled true
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
              signingConfig signingConfigs.config
          }
      }
  }
  
  repositories {
      maven { url "http://dl.bintray.com/populov/maven" }
      maven { url 'https://maven.fabric.io/public' }
  
      mavenCentral()
      maven { url "https://jitpack.io" }
  
  }
  
  //compile 'com.labo.kaji:fragmentanimations:0.1.0'
  
  dependencies {
      compile fileTree(dir: 'libs', include: ['*.jar'])
      testCompile 'junit:junit:4.12'
      compile('com.crashlytics.sdk.android:crashlytics:2.5.5@aar') {
          transitive = true;
      }
      compile 'com.google.firebase:firebase-core:9.2.1'
      compile 'com.google.firebase:firebase-messaging:9.2.1'
      compile 'com.google.android.gms:play-services-auth:9.2.1'
      androidTestCompile 'com.android.support:support-annotations:24.1.1'
      compile 'com.android.support:appcompat-v7:24.1.1'
      compile 'com.android.support:design:24.1.1'
      compile 'com.android.support:cardview-v7:24.1.1'
      compile 'com.android.support:support-v4:24.1.1'
      compile 'com.squareup.picasso:picasso:2.5.2'
      compile 'de.hdodenhof:circleimageview:2.1.0'
      compile 'com.makeramen:roundedimageview:2.2.1'
      compile 'com.squareup.okhttp:logging-interceptor:2.7.0'
      compile 'com.squareup.retrofit:converter-jackson:2.0.0-beta2'
      compile 'com.squareup.retrofit2:retrofit:2.1.0'
      compile 'com.github.bumptech.glide:glide:3.7.0'
      compile 'com.viewpagerindicator:library:2.4.1@aar'
      compile 'com.koushikdutta.ion:ion:2.+'
      compile 'com.soundcloud.android:android-crop:1.0.1@aar'
      compile 'com.github.2359media:EasyAndroidAnimations:0.8'
      compile 'com.appsee:appsee-android:+'
      compile 'com.google.android.gms:play-services-appindexing:9.2.1'
  }
  apply plugin: 'com.google.gms.google-services'
  </code></pre>