Merge pull request #1 from adlnet/master

update fork with master
Update xAPI.md
Updated Section 4.1.4 Objects
Updated vocabulary mistakes
actDef optional/required + url

* updated activity definition optional/required column (added "recommended")
* re-named url -> moreInfo
* trimmed interaction info row
Merge pull request #6 from bscSCORM/objects

actDef optional/required + url
Merge pull request #243 from andyjohnson/master

Edits to Section 4.1.4 Objects
cleaned up anchors
§4.1.9 Case typo in "objectType" : "group"
Fixes Issue #237
Merge pull request #250 from scara/v10_Typo_ObjectType_group

§4.1.9 Case typo in "objectType" : "group"
Merge pull request #7 from adlnet/master

Sync up!
Merge pull request #251 from andyjohnson/master

Sync up!
Merge pull request #8 from adlnet/master

Sync up!
Appendix A - Bookmarklet: JS error, "TypeError: definition is undefined"
Fixes Issue #246
4.1.5 Score
§4.1.3 Verb: 'verb' is an object
Minor indentation cleanup
$4.1.5, Duration: minor typo, wrong links to Wikipedia
Fixes Issue #236
§4.1, links to Wikipedia's ISO 8601: minor typos
Fixes Issue #235
minor signature fixes

* noted exceptions to equivalence check for statement signing
* fixed example signature
* noted newline format used to generate example signature
* fixed typo -- "definitio"