add version info for sdks (#210)

Author: VinayGuthal

firebase-common/firebase-common.gradle

@@ -25,7 +25,7 @@ android {
     defaultConfig {
       minSdkVersion 14
       targetSdkVersion androidVersion
-
+      versionName version
       multiDexEnabled true
       testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }

firebase-common/src/test/java/com/google/firebase/VersionGenerationTest.java

@@ -0,0 +1,27 @@
+// Copyright 2018 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.firebase;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import org.junit.Test;
+
+public class VersionGenerationTest {
+
+  @Test
+  public void isVersionGenerated_shouldNotBeEmpty() {
+    assertThat(BuildConfig.VERSION_NAME).isNotEmpty();
+  }
+}

firebase-database/firebase-database.gradle

@@ -36,6 +36,7 @@ android {
     defaultConfig {
         targetSdkVersion androidVersion
         minSdkVersion 14
+        versionName version
         multiDexEnabled true
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }

firebase-firestore/firebase-firestore.gradle

@@ -57,6 +57,7 @@ android {
     defaultConfig {
         targetSdkVersion androidVersion
         minSdkVersion 14
+        versionName version
         multiDexEnabled true
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }

firebase-functions/firebase-functions.gradle

@@ -25,7 +25,7 @@ android {
     defaultConfig {
         targetSdkVersion androidVersion
         minSdkVersion 14
-
+        versionName version
         multiDexEnabled true
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }

firebase-storage/firebase-storage.gradle

@@ -37,6 +37,7 @@ android {
         targetSdkVersion androidVersion
         minSdkVersion 14
         multiDexEnabled true
+        versionName version
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }