Revert "Removed unused Android Lifecycle dependencies (#55)"

This reverts commit 5e25b96.

Author: ashwinraghav

firebase-database/firebase-database.gradle

@@ -82,6 +82,10 @@ dependencies {
     implementation "com.google.android.gms:play-services-basement:$playServicesVersion"
     implementation "com.google.android.gms:play-services-base:$playServicesVersion"
     implementation "com.google.android.gms:play-services-tasks:$playServicesVersion"
+    implementation 'android.arch.lifecycle:runtime:1.1.1'
+    implementation "android.arch.lifecycle:common:1.1.1"
+    implementation "android.arch.core:runtime:1.1.1"
+    implementation "android.arch.core:common:1.1.1"
 
     androidTestImplementation "com.android.support:support-annotations:$supportAnnotationsVersion"
     androidTestImplementation 'com.android.support.test:rules:1.0.2'
@@ -109,4 +113,4 @@ dependencies {
 // androidTest integration tests.
 // ==========================================================================
 ext.packageName = "com.google.firebase.database"
-apply from: '../gradle/googleServices.gradle'
+apply from: '../gradle/googleServices.gradle'

firebase-firestore/firebase-firestore.gradle

@@ -104,6 +104,9 @@ dependencies {
         exclude group: "com.google.firebase", module: "firebase-common"
     }
 
+    implementation 'android.arch.lifecycle:runtime:1.1.1'
+    implementation 'android.arch.lifecycle:common:1.1.1'
+
     testCompile 'junit:junit:4.11'
     testCompile 'org.mockito:mockito-core:1.10.19'
     testCompile 'org.robolectric:robolectric:4.0-alpha-3'

firebase-storage/firebase-storage.gradle

@@ -78,6 +78,10 @@ dependencies {
 
     implementation "com.google.android.gms:play-services-base:$playServicesVersion"
     implementation "com.google.android.gms:play-services-tasks:$playServicesVersion"
+    implementation 'android.arch.lifecycle:runtime:1.1.1'
+    implementation "android.arch.lifecycle:common:1.1.1"
+    implementation "android.arch.core:runtime:1.1.1"
+    implementation "android.arch.core:common:1.1.1"
 
     androidTestImplementation "com.android.support:support-annotations:$supportAnnotationsVersion"
     androidTestImplementation 'com.android.support.test:rules:1.0.2'
@@ -88,4 +92,4 @@ dependencies {
     testImplementation 'junit:junit:4.12'
     testImplementation 'org.mockito:mockito-core:2.18.3'
     testImplementation 'org.robolectric:robolectric:4.0-alpha-3-SNAPSHOT'
-}
+}