It tends to pop back into function apps where it is not needed
otherwise. Users that want to use the library need to import
the FunctionConfiguration directly using the
@EnableFunctionDeployer convenience annotation..
Instead of an app, it is now a library with some utilities
(principally ApplicationBootstrap) for launching a Spring Boot
application, extracting a function, and registering it in the
FunctionRegistry.
Functions are namespaced under the "app name", e.g.
/sample/uppercase is the "uppercase" function in the "sample" app.
Also added a README to get started quickly.
