Update 19-automattic.md

- "evidenced already the considerable volunteer time", not sure if this is missing a 'by' as in "evidenced already by the considerable volunteer time", so didn't include it.
For reference, about the corrections of big sites' names:
- Gigaom: https://about.gigaom.com/
- TechCrunch: http://techcrunch.com/about/
- Scobleizer: http://scobleizer.com/ (ironically, the last post on his blog is about moving on to fb/twitter/G+)
Create new folders
Edited Part 5
Move 2.7 admin image
Update image links
Fix formatting issues
Remove smilie image

shows current smilies + wp.com smilies, not Tango/Gnome
Move capital p dangit image
Formatting changes
Merge pull request #49 from cioccolato/Typo-Fixes-in-19-automattic

Typo fixes in 19 automattic
Add end matter to Parts 4 & 5
Merge pull request #6 from WordPress/master

Update to latest WordPress/book