Fix major loading time problems. When there are more than 3 contexts, loading time just to get the list was huge:

- Move YML file search and loading code to new method loadAllContexts() method that runs on Provision::__construct().
- Ensure dependent contexts can be loaded (using loadContext() method).
- Refactor objects to always be "ProvisionAware".
- Remove static functions for public and private.
- Fix ContextNodeDefinition to use ProvisionAwareTrait.

- Removing commented and unused code.
- Removing unneeded configureIO now that LoggerAwareTrait is available.
- Add replacement to doRunCommand to allow setting of services.

- Replace ->application->io-> with getProvision()->io();

Giving Service BuilderAwareTrait and use taskExec() for apache restart. Adding a hidden example of using Robo Tasks in Platform verification.

Using BuilderAwareTrait to allow Robo-command style task() building in Provision and Context classes.

- Catch bad config errors.

- Create a "Provision" base class.
- Load in our existing Application so our existing commands are still available.
- Add a provision-robo.php executable file and change the include in bin/provision.