Standardize Build

The build now uses spring build conventions to simplify the build

Fixes gh-4284

samples/boot/helloworld/build.gradle

@@ -1,16 +0,0 @@
-apply from: BOOT_SAMPLE_GRADLE
-
-springBoot {
-    mainClass = 'org.springframework.security.samples.HelloWorldApplication'
-}
-
-dependencies {
-    compile "org.springframework.boot:spring-boot-starter-web",
-            "org.springframework.boot:spring-boot-starter-thymeleaf",
-            "org.thymeleaf.extras:thymeleaf-extras-springsecurity4:2.1.2.RELEASE",
-            project(":spring-security-config"),
-            project(":spring-security-web")
-
-    testCompile "org.springframework.boot:spring-boot-starter-test",
-            project(":spring-security-test")
-}

samples/boot/helloworld/spring-security-samples-boot-helloworld.gradle

@@ -0,0 +1,12 @@
+apply plugin: 'io.spring.convention.spring-sample-boot'
+
+dependencies {
+	compile project(':spring-security-config')
+	compile project(':spring-security-web')
+	compile 'org.springframework.boot:spring-boot-starter-thymeleaf'
+	compile 'org.springframework.boot:spring-boot-starter-web'
+	compile 'org.thymeleaf.extras:thymeleaf-extras-springsecurity4'
+
+	testCompile project(':spring-security-test')
+	testCompile 'org.springframework.boot:spring-boot-starter-test'
+}

samples/boot/insecure/build.gradle

@@ -1,12 +0,0 @@
-apply from: BOOT_SAMPLE_GRADLE
-
-springBoot {
-    mainClass = 'org.springframework.security.samples.InsecureApplication'
-}
-
-dependencies {
-    compile "org.springframework.boot:spring-boot-starter-web",
-            "org.springframework.boot:spring-boot-starter-thymeleaf"
-
-    testCompile "org.springframework.boot:spring-boot-starter-test"
-}

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

@@ -0,0 +1,8 @@
+apply plugin: 'io.spring.convention.spring-sample-boot'
+
+dependencies {
+	compile 'org.springframework.boot:spring-boot-starter-thymeleaf'
+	compile 'org.springframework.boot:spring-boot-starter-web'
+
+	testCompile 'org.springframework.boot:spring-boot-starter-test'
+}