Fixed Android build issues

mobile/android/build.gradle

@@ -15,6 +15,7 @@ buildscript {
 
 allprojects {
     repositories {
+        google()
         mavenLocal()
         jcenter()
         maven {

mobile/android/gradle.properties

@@ -18,3 +18,4 @@
 # org.gradle.parallel=true
 
 android.useDeprecatedNdk=true
+# android.enableAapt2=false

mobile/android/rename-apk

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
-OLD_APK=${SCRIPT_DIR}/app/build/outputs/apk/app-release.apk
+OLD_APK=${SCRIPT_DIR}/app/build/outputs/apk/release/app-release.apk
 VERSION=$(cat $SCRIPT_DIR/../../scratch/version.txt)
 NEW_APK=$(dirname $OLD_APK)/deighton-ar-${VERSION}.apk