Upgrade Android build and components

mobile/android/app/build.gradle

@@ -94,8 +94,8 @@ def enableSeparateBuildPerCPUArchitecture = false
 def enableProguardInReleaseBuilds = false
 
 android {
-    compileSdkVersion 23
-    buildToolsVersion "23.0.3"
+    buildToolsVersion "27.0.3"
+    compileSdkVersion 25
 
     defaultConfig {
         applicationId "com.deightonar"
@@ -149,9 +149,10 @@ android {
 }
 
 dependencies {
-    compile fileTree(dir: "libs", include: ["*.jar"])
-    compile "com.android.support:appcompat-v7:25.0.0"
-    compile "com.facebook.react:react-native:+"  // From node_modules
+    compile fileTree(include: ['*.jar'], dir: 'libs')
+    compile 'com.android.support:appcompat-v7:25.0.0'
+    compile 'com.facebook.react:react-native:+'
+    // From node_modules
     compile project(':gvr_common')
     compile project(':arcore_client')
     compile project(path: ':react_viro')