Adding app icons and fixing device builds

mobile/android/app/build.gradle

@@ -94,13 +94,13 @@ def enableSeparateBuildPerCPUArchitecture = false
 def enableProguardInReleaseBuilds = false
 
 android {
-    compileSdkVersion 27
-    buildToolsVersion "26.0.2"
+    compileSdkVersion rootProject.ext.compileSdkVersion
+    buildToolsVersion rootProject.ext.buildToolsVersion
 
     defaultConfig {
         applicationId "com.deightonar"
-        minSdkVersion 16
-        targetSdkVersion 22
+        minSdkVersion rootProject.ext.targetSdkVersion
+        targetSdkVersion rootProject.ext.targetSdkVersion
         versionCode 1
         versionName "1.0"
         ndk {
@@ -138,9 +138,10 @@ android {
 
 dependencies {
     compile fileTree(dir: "libs", include: ["*.jar"])
-    compile "com.android.support:appcompat-v7:23.0.1"
+    compile "com.android.support:appcompat-v7:${rootProject.ext.supportLibVersion}"
     compile "com.facebook.react:react-native:+"  // From node_modules
     compile project(':react-native-navigation')
+    compile project(':react-native-maps')
 }
 
 // Run this once to be able to run the application with BUCK