Complete wiki documentation

[DavidMGross]

The wiki docs should:

1. Describe how Fenzo fits in to a Framework=>Mesos=>Cloud Cluster environment, from the point of view of the Mesos community.
2. Describe how to use the various features of the Fenzo API, from the point of view of Java developers.

Some questions to answer:

• How do I use Fenzo to control autoscaling, and how can I automate this with framework resource allocations?
• How do I establish custom slave attributes that I can then use as constraints?
• How do I get jobs that use similar resources allocated to the same instance so as to reduce resource use?
• How do I adjust task urgency? How can I create & deploy fitness calculator plugins that do this in an automated way?
• What are hard and soft constraints, and how do I distinguish them?

A possible outline:

1. Intro
2. Getting started
3. Fenzo design and concepts
4. How to use Fenzo
5. Constraint evaluator plugins
6. Fitness calculator plugins
7. Autoscaling the cluster
8. Appendix: JavaDocs

[DavidMGross]

By attaching this image to a comment to this issue, I can also add it to the wiki (for some reason Github lets you upload images to issue comments but not to wiki pages... go fig.)

[DavidMGross]

Alas, I have to upload a new image to make an edit...