Refactoring samples

Restructuring the samples repository
Add more docker support
Add acceptance tests for the apps
Adding sensor average processor sample
Remove aggregate samples

testing-samples/test-embedded-kafka/README.adoc

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+Spring Cloud Stream Testing with Embedded Kafka Broker Sample
+==============================================================
+
+In this *Spring Cloud Stream* sample, an embedded kafka broker is used for testing.
+
+## Requirements
+
+To run this sample, you will need to have installed:
+
+* Java 8 or Above
+
+## Code Tour
+
+This sample is a Spring Boot application that uses Spring Cloud Stream to receive a `String` message and forward an upper case version of that String; it uses the Kafka binder.
+
+* EmbeddedKafkaApplication - the Spring Boot Main Application
+* EmbeddedKafkaApplicationTests - the test case
+
+The `spring-kafka-test` dependency added to the `pom.xml` puts the `KafkaEmbedded` JUnit `@Rule` on the class path.
+Refer to the [Spring for Apache Kafka Reference Manual](http://docs.spring.io/spring-kafka/reference/htmlsingle/#testing) for more information about this.
+Notice how the `@BeforeClass` method sets up the Boot and binder properties to locate the servers.
+
+See the test method for the details on interacting with Embedded Kafka.
+The test method starts by sending a message to the input destination.
+It then creates a consumer to consume from the output destination; gets the output message and asserts that it's an upper case version of the sent message.
+
+## Building with Maven
+
+Build the sample and run the test by executing:
+
+`./mvnw clean package`
+
+or run the test in your favorite IDE.
+