Improve quality of examples

[wilcowijbrandi]

I have noticed these examples are not of a desired quality yet. If you are looking for examples of FPAI Apps, I would still recommend you take a look at the fpai-apps repository (https://github.com/flexiblepower/fpai-apps). The simulated appliances in there should also be fairly easy to understand.

The following this should be checked before a release:

• Make sure all examples use immutable objects to send messages. The current example is WRONG and will lead to errors!
• Check for references of the ScheduledExecutorService and TimeService, both are deprecated and should be replaced by the FlexiblePowerContext
• Check if tests function properly
• Apply checkstyle
• Add to Jenkins (http://fpai-ci.sensorlab.tno.nl)
• Improve documentation in code, these are examples after all