Standardize Build

The build now uses spring build conventions to simplify the build

Fixes gh-4284

samples/javaconfig/preauth/spring-security-samples-javaconfig-preauth.gradle

@@ -0,0 +1,19 @@
+apply plugin: 'io.spring.convention.spring-sample-war'
+
+dependencies {
+	compile project(':spring-security-config')
+	compile project(':spring-security-core')
+	compile project(':spring-security-samples-javaconfig-messages')
+	compile project(':spring-security-web')
+	compile 'javax.servlet.jsp.jstl:javax.servlet.jsp.jstl-api'
+	compile 'javax.validation:validation-api'
+	compile 'org.hibernate:hibernate-validator'
+	compile 'org.springframework:spring-jdbc'
+	compile 'org.springframework:spring-webmvc'
+	compile slf4jDependencies
+
+	providedCompile 'javax.servlet:javax.servlet-api'
+	providedCompile 'javax.servlet.jsp:javax.servlet.jsp-api'
+
+	runtime 'opensymphony:sitemesh'
+}