Merge pull request #21 from adlnet/master

Sync!
Update/Restructure 4.1
Reorder 4.1.2 4.1.3 Details before Requirements.  Slight word changes.
Fixed 4.1.4 - Restructured, eliminated confusing headings, Still don't like "Requirements for Metadata"
4.1.5-4.1.8 Just Restructuring
Part 1 Attachments Edit
4.11 and 4.12 restructure/rewrite, includes typo on "applicaton"
Add Description to loose text in 4.0
Update xAPI.md
Update xAPI.md
Update xAPI.md
Update xAPI.md
Update xAPI.md
Fixed broken link in tables

Links in tables have to use html, not markdown.
fixed incorrectly formatted notes
Downgraded h7 to h6 because h7 doesn't exist and didn't work
fixed another couple of notes
group to Group in context instructor
fixed some capitalisation
changed targetting to targeting