Adds Spyral-Narwhals' presentation materials

Includes directory with README.md, executive summary, and presentation
slideshow.
Adds PDF version of presentation

Adds the PDF of the presentation instead of ODF
Edits Presentation.odf/pdf and executiveSummary.pdf

Presentation:
- Adds two slides, What Went Right? and What Went Wrong?

ExecutiveSummary:
- Fixes some content that was left off in the MVC section.
Adds more to Presentation, Includes Burndown

Updates presentation with burndown charts and game screenshots. Includes
spreadsheet of burndown charts.
Removes README.txt, ADDS README.md

Replace the README.txt with README.md
Merge pull request #34 from Boozel/master

Adds Directory and Presentation Materials for Spyral-Narwhals