Add Firebase analytics

build.gradle

@@ -1,11 +1,10 @@
-// Top-level build file where you can add configuration options common to all sub-projects/modules.
-
 buildscript {
     repositories {
         jcenter()
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:2.3.3'
+        classpath 'com.google.gms:google-services:3.1.0'
     }
 }