Configure dependencies using the plugin

This CL changes gradle plugin to automatically include necessary
dependencies for data binding. This way, just applying data
binding to a project will be sufficient.

I've also updated version to .9 to get ready for preview release

Bug: 21262586
Change-Id: I12ba64915e69b383b507d155c1a16267356e059b
diff --git a/integration-tests/MultiModuleTestApp/build.gradle b/integration-tests/MultiModuleTestApp/build.gradle
index b9340e5..ddf912c 100644
--- a/integration-tests/MultiModuleTestApp/build.gradle
+++ b/integration-tests/MultiModuleTestApp/build.gradle
@@ -27,8 +27,8 @@
         }
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:1.1.3'
-        classpath "com.android.databinding:dataBinder:${config.snapshotVersion}"
+        classpath "com.android.tools.build:gradle:${config.androidPluginVersion}"
+        classpath "com.android.databinding:dataBinder:${config.version}"
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
     }