Standardize Build

The build now uses spring build conventions to simplify the build

Fixes gh-4284

samples/javaconfig/aspectj/build.gradle

@@ -1,9 +0,0 @@
-
-dependencies {
-	compile project(':spring-security-core'),
-			project(':spring-security-config')
-
-	aspectpath project(':spring-security-aspects')
-
-	runtime project(':spring-security-aspects')
-}

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

@@ -0,0 +1,15 @@
+apply plugin: 'io.spring.convention.spring-sample'
+apply plugin: 'aspectj'
+
+repositories {
+	mavenCentral()
+}
+
+dependencies {
+	compile project(':spring-security-config')
+	compile project(':spring-security-core')
+
+	aspectpath project(':spring-security-aspects')
+
+	runtime project(':spring-security-aspects')
+}