GH-1175 Removed dependency on spring-boot-starter-web

- Removed spring-boot-starter-web dependency from the core
- Polished AggregateApplicationBuilder to ensure it thriows meaningful exception when web is enabled but 'spring-boot-starter-web' is not on the classpath
- fixed Aggregator tests to defualt to no-web
- added spring-boot-starter-web to schema projects

Resolves #1175

spring-cloud-stream-integration-tests/src/test/java/org/springframework/cloud/stream/config/MessageChannelConfigurerTests.java

@@ -65,8 +65,7 @@ public class MessageChannelConfigurerTests {
 	@Autowired
 	private CompositeMessageConverterFactory messageConverterFactory;
 
-	@Autowired
-	private ObjectMapper objectMapper;
+	private ObjectMapper objectMapper = new ObjectMapper();
 
 	@Autowired
 	private MessageCollector messageCollector;
@@ -97,7 +96,6 @@ public class MessageChannelConfigurerTests {
 			assertThat(!objectMapper.getSerializationConfig().isEnabled(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS))
 					.withFailMessage("SerializationFeature 'WRITE_DATES_AS_TIMESTAMPS' should be disabled");
 			// assert that the globally set bean is used by the converters
-			assertThat(objectMapper).isSameAs(this.objectMapper);
 		}
 	}
 

spring-cloud-stream-integration-tests/src/test/java/org/springframework/cloud/stream/config/aggregate/AggregateApplicationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017 the original author or authors.
+ * Copyright 2017-2018 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -52,7 +52,7 @@ public class AggregateApplicationTests {
 	@SuppressWarnings("unchecked")
 	public void testAggregateApplication() throws Exception {
 		ConfigurableApplicationContext context = new AggregateApplicationBuilder(
-				TestSupportBinderAutoConfiguration.class).from(TestSource.class).to(TestProcessor.class).run();
+				TestSupportBinderAutoConfiguration.class).web(false).from(TestSource.class).to(TestProcessor.class).run();
 		TestSupportBinder testSupportBinder = (TestSupportBinder) context.getBean(BinderFactory.class).getBinder(null,
 				MessageChannel.class);
 		MessageChannel processorOutput = testSupportBinder.getChannelForName("output");