implements go to slide, search for slide, and status line

With all my love and devotion for atomic commits.
updates the dependency on pygments.rb
adds support for passing slides with left and right arrows [closes #7]
Speed up the transition for lengthier slides

Sleeping 0.002 works great for slides that don't have a lot of text, but
it tends to take a lot for ones that do. This can get very annoying when
you're moving back and forth between longer slides.
Merge pull request #8 from skanev/stable-transitions

Speed up the transition for lengthier slides
updates requirements
documents a way to generate a PDF with the slides
Update the README to reflect my fork
Remove examples + screenshots
Use different section decoration