Add new feature to initialize a Supplier from a remote HTTP endpoint

Kind of like the SupplierExporter but to create the Supplier itself.
With this in place you can define the templateUrl (destination) and
the originaUrl (source) and use the app as a pipeline for events
from/to HTTP.

Provide functional bean support for HTTP export

Add autoconfig to AWS adapter for custom runtime

Fix HttpSupplier to always supply Message if headers are included

Fix registration of origin supplier in functional beans

Add docs on new AWS features

Add custom runtime sample

spring-cloud-function-samples/function-sample-aws-custom/src/test/java/com/example/LambdaApplicationTests.java

@@ -0,0 +1,18 @@
+package com.example;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.springframework.cloud.function.context.test.FunctionalSpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+@RunWith(SpringRunner.class)
+@FunctionalSpringBootTest
+public class LambdaApplicationTests {
+
+	@Test
+	public void contextLoads() {
+	}
+
+}
+