Merge pull request #73 from jubeira/task/add_google_repo

Adding google to repository list in buildscript.gradle.

Author: Juan Ignacio Ubeira

buildscript.gradle

@@ -41,6 +41,7 @@ rootProject.buildscript {
         maven {
             url "https://github.com/rosjava/rosjava_mvn_repo/raw/master"
         }
+        google()
         jcenter()
     }
     dependencies {

gradle_plugins/src/main/groovy/org/ros/gradle_plugins/RosAndroid.groovy

@@ -11,7 +11,7 @@ class RosAndroidPlugin implements Plugin<Project> {
   void apply(Project project) {
     project.apply plugin: "ros"
     project.extensions.create("rosandroid", RosAndroidPluginExtension)
-    project.rosandroid.buildToolsVersion = "25.0.2"
+    project.rosandroid.buildToolsVersion = "28.0.3"
 
     /********************************************************************** 
      * Publishing - not we're using old style here. Upgrade to maven-publish