Standardize Build

The build now uses spring build conventions to simplify the build

Fixes gh-4284

samples/xml/insecure/build.gradle

@@ -1,14 +0,0 @@
-apply from: WAR_SAMPLE_GRADLE
-
-dependencies {
-
-	providedCompile "javax.servlet:javax.servlet-api:3.0.1",
-					'javax.servlet.jsp:jsp-api:2.1'
-
-	compile jstlDependencies,
-			"org.slf4j:jcl-over-slf4j:$slf4jVersion"
-
-	runtime "ch.qos.logback:logback-classic:$logbackVersion"
-
-	integrationTestCompile gebDependencies
-}

samples/xml/insecure/spring-security-samples-xml-insecure.gradle

@@ -0,0 +1,11 @@
+apply plugin: 'io.spring.convention.spring-sample-war'
+
+dependencies {
+	compile jstlDependencies
+	compile slf4jDependencies
+
+	providedCompile 'javax.servlet:javax.servlet-api'
+	providedCompile 'javax.servlet.jsp:javax.servlet.jsp-api'
+
+	integrationTestCompile gebDependencies
+}