Auto-configure Spring Security OAuth2 when detected on the classpath

* Automatically spin up Authorization Server and Resource Server
* Automatically configures method level security included OAuth2Expression handler
* Wrote extensive unit tests verifying default behavior as well as the auto-configuration backing off when custom Authorization/Resource servers are included
* Created org.springframework.boot.security.oauth2 subpackage to contain it
* Can also disable either resource of authorization server completely with a single property for each
* Print out the auto-generated secrets and other settings
* Added spring-boot-sample-secure-oauth2 to provide a sample that can be run and poked with curl as well as some automated tests.
* Make users ask for which servers to install by adding @Enable*
* User has to @EnableGlobalMethodSecurity instead of using properties files

Add Spring Security OAuth2 support to Spring Boot CLI

* Triggered from either @EnableAuthorizationServer or @EnableResourceServer
* Needs to have @EnableGlobalMethodSecurity to allow picking the annotation model.
* By default, comes with import support for @PreAuthorize, @PreFilter, @PostAuthorize, and @PostFilter via a single start import
* Also need import support for the enable annotations mentioned above.
* Added extra test case and sample (oauth2.groovy)

spring-boot-cli/src/main/java/org/springframework/boot/cli/compiler/autoconfigure/SpringSecurityOAuth2CompilerAutoConfiguration.java

@@ -0,0 +1,58 @@
+/*
+<<<<<<< HEAD
+ * Copyright 2012-2014 the original author or authors.
+=======
+ * Copyright 2012-2013 the original author or authors.
+>>>>>>> 12b17e3... Add Spring Security OAuth2 support to Spring Boot CLI
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.cli.compiler.autoconfigure;
+
+import org.codehaus.groovy.ast.ClassNode;
+import org.codehaus.groovy.control.CompilationFailedException;
+import org.codehaus.groovy.control.customizers.ImportCustomizer;
+import org.springframework.boot.cli.compiler.AstUtils;
+import org.springframework.boot.cli.compiler.CompilerAutoConfiguration;
+import org.springframework.boot.cli.compiler.DependencyCustomizer;
+
+/**
+ * {@link CompilerAutoConfiguration} for Spring Security OAuth2.
+ *
+ * @author Greg Turnquist
+ */
+public class SpringSecurityOAuth2CompilerAutoConfiguration extends CompilerAutoConfiguration {
+
+	@Override
+	public boolean matches(ClassNode classNode) {
+		return AstUtils.hasAtLeastOneAnnotation(classNode,
+				"EnableAuthorizationServer", "EnableResourceServer");
+	}
+
+	@Override
+	public void applyDependencies(DependencyCustomizer dependencies) throws CompilationFailedException {
+		dependencies.add("spring-security-oauth2").add("spring-boot-starter-web")
+			.add("spring-boot-starter-security");
+	}
+
+	@Override
+	public void applyImports(ImportCustomizer imports) throws CompilationFailedException {
+		imports
+			.addImports(
+					"org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity")
+			.addStarImports(
+					"org.springframework.security.oauth2.config.annotation.web.configuration",
+					"org.springframework.security.access.prepost");
+	}
+}