Add `git fetch -v --dry-run

Helps to check before running a fetch what changes may or may not need to be merged.
Update git-commands.md
Update git-commands.md
Update git-commands.md
Update git-commands.md
Merge pull request #12 from scottgruber/master

Add `git fetch -v --dry-run …
proper grammar
added quick start
spacing
just some language tweaks
Added new guide introducing SSH management and configuration
Merge pull request #14 from blobaugh/master

Added new guide introducing SSH management and configuration
Typo