HydeSlides fragment-diagram build step support
Rebase diagrams
Changed transition to linear
Added multi-step merge diagrams
Added styling for diagrams and fragment elements
Updated slide titles, chapter titles, and diagrams
Resolved default scaling issues and GitHub style overrides of RevealJS layout
Revised HydeSlides diagram group border styling
Merge pull request #47 from github/foundations-buildsteps

HydeSlides build-steps implementation for GH themes slide decks