Bug 33559: Update tor-android-service for new Android toolchain

Patch based on work done by sisbell, thanks!

build.gradle

@@ -6,6 +6,7 @@ buildscript {
         mavenLocal()
         google()
         mavenCentral()
+        maven { url "https://repo.spring.io/plugins-release" }
     }
     dependencies {
         classpath "com.android.tools.build:gradle:${androidplugin}"
@@ -23,4 +24,4 @@ allprojects {
         maven { url "https://repo.spring.io/plugins-release" }
         maven { url "https://raw.githubusercontent.com/guardianproject/gpmaven/master" }
     }
-}
\ No newline at end of file
+}