Standardize Build

The build now uses spring build conventions to simplify the build

Fixes gh-4284

data/data.gradle

@@ -1,6 +0,0 @@
-dependencies {
-	compile project(':spring-security-core'),
-			springCoreDependency,
-			"org.springframework.data:spring-data-commons:$springDataCommonsVersion"
-
-}

data/spring-security-data.gradle

@@ -0,0 +1,7 @@
+apply plugin: 'io.spring.convention.spring-module'
+
+dependencies {
+	compile project(':spring-security-core')
+	compile 'org.springframework.data:spring-data-commons'
+	compile 'org.springframework:spring-core'
+}