Update Stash chapter example, notes
Add Reflog expire all note
Add Branch chapter move name
Add Log search chapter slide
Add Merge chapter slide for checkout options
Update "What is a Commit" with build-out diagram
Add Commit chapter shorthand slides
Rename Diff Options slide for title clarity
Fix duplicate Log search slide info

Removed duplicate -S option example, added
space for -S option for visual clarity

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Update RM-MV slide with clearer title, improved diagram

Updated title, omitting the "five states of..." reference
and removed ignore as state of "tracking" in diagram.
Provides for clearer concept within the RM/MV content.
Merge pull request #146 from github/foundations-note-updates

Foundations Slide Deck Content & Notes Update