Add the license of dependencies into LICENSE file

Partially-closes: apache/incubator-openwhisk-release#109

Update .md and .sh files to pass scancode with latest .cfg

update NOTICE file

add webhook for slack notification of PR results

Add the NOTICE file

Use actionproxy from dockerSkeleton do not clown and own is the motto FTW!

Update README.md

Fix typos

* Use akka distributed map to store the shared state

* Join seed nodes in the load balancer service

* Add optional auto-down-unreachable-after

* Local bookkeeping is used by default

* Update documentation

Formats all .scala files according to `scalafmt`'s (opinionated) style. 
Adds Travis checks for correctly formatted code.

Using `object`s instead of a hollow class as the "factory" for an Spi makes them being singleton by default, which reduces boilerplate to implement an Spi.

The `Dependencies` object is not used anywhere and there might be better alternatives which we can decide on once the need of them comes up. For now, the Spi's interfaces are relatively tightly coupled to their current default implementations anyway.

Also updated documentation.

- Refactoring the invoker for better encapsulation and separation of concerns in its packages.
- Removing Dispatcher.
- Remove unused properties from the deployment manifests.
- Add error handling for terminal failures