Standardize the presentation automation and minor editing

* Use Ruby 2.1.2
* Use "presentation standard" gems
* Use "presentation standard" rake tasks and naming of the files
* Change the contact info
* Minor editing
Change the slides to fit and correct the copy
Use 'bundle exec' in rake tasks

Use 'bundle exec' to avoid problems when calling the `slideshow build`
cli tool.
Merge pull request #1 from xarisd/standardize

Standardize the presentation code