Add Strategy Pattern and User Interface sections to README.

  * Explain strategy pattern in a way hopefully useful to collaborators
  * Explain UI design philosophy
Merge pull request #53 from banana-slugs-2014/elaborate_readme

Add Strategy Pattern and User Interface sections to README.

I am tired of seeing this and it is just the readme so I'm merging it myself.
Merge pull request #52 from banana-slugs-2014/add_age_to_seeds

Add age and name to user seeds