Fix #993:Updating gradle dependancies

Author: AkshGautam

build.gradle

@@ -6,13 +6,13 @@ task clean(type: Delete) {
 // Define versions in a single place
 ext {
     // Sdk and tools
-    minSdkVersion = 11
-    targetSdkVersion = 25
-    compileSdkVersion = 25
-    buildToolsVersion = '24.0.2'
+    minSdkVersion = 15
+    targetSdkVersion = 27
+    compileSdkVersion = 27
+    buildToolsVersion = '27.0.3'
 
     // App dependencies
-    supportLibraryVersion = '25.1.1'
+    supportLibraryVersion = '27.1.1'
     playServicesVersion = '10.0.1'
     mapUtilsServices = '0.4.2'
     daggerVersion = '2.2'

mifosng-android/build.gradle

@@ -21,6 +21,7 @@ repositories {
     mavenCentral()
     maven { url 'https://maven.fabric.io/public' }
     jcenter()
+    maven { url "https://maven.google.com" }
     maven { url "https://jitpack.io" }
     maven { url 'http://dl.bintray.com/amulyakhare/maven' }
 }