Update paths_and_sondboxes.md

Fix typo
Include superpower img directly.
Merge pull request #16 from codefellows/br-edits

Include superpower img directly. Expand a little.
Merge pull request #14 from enilsen16/master

Close #12 Verify linux installation instructions
Merge pull request #15 from N-Manos/master

Fix typo
first pass at chapter 2