Added first-draft Git Advanced slides
Refining Advanced chapter slides content, examples, notes
Namespaced all Advanced slide tags
Add advanced to list of presentations. Add intro to advanced slides.
Make bisect content more granular
Make bisect content more granular
Advanced branch chapter rough draft added
Granular, additional segment Advanced slides

Following team contributions, continued separating slide examples
and topic descriptions into smaller segments.

Chapters with updated slides include Collaboration, Filter-Branch,
The-GitHub-Way, and Customizing.
Advanced Remote chapter explanations

Improved the examples of git remote options and
the explanations of each commands' side effects
Tidy/Rewrite all Remote Customization slides
Correct refspec example in Remote chapter
Merge pull request #118 from github/slides-advanced

Added Git Advanced slides