Consolidated stream samples - updated and function based (#143)

* Consolidate stream samples and update to use functions

* Address review comments

* Revert value.contains

dataflow-website/stream-developer-guides/streams/standalone-stream-sample/README.md

@@ -0,0 +1,29 @@
+# Standalone Stream Sample
+
+## Building the apps
+
+Use the appropriate binder profiles `kafka` (active by default) or `rabbit` to build a binary for use with that binder.
+
+```bash
+$./mvnw clean package -Pkafka
+```
+or
+
+```bash
+$./mvnw clean package -Pkafka
+```
+
+## Building Docker Images
+
+```bash
+$./mvnw spring-boot:build-image
+```
+
+## Building the distribution zip file
+
+```bash
+$./mvnw package -Pdist
+
+```
+
+This must be run from this directory and will build `dist/usage-cost-stream-sample.zip`