Updated four Appendix references.

Some of the Appendix links are referencing the wrong part of the
Appendix.  One is no longer in the spec.
removed invalid extra comma in JSON

Appendix B#3 (Group) is now valid JSON
fixed indents

Appendix B ex. 4 (Statement) had extra indents
fixed invalid URI

Appendix B#3 (Group) had an openid which must be a URI, but was missing the scheme
Merge pull request #469 from chaimleib-scorm/master

bug fixes in examples
Merge pull request #468 from chrishandorf/master

Updated four Appendix references.
Fixed Verb example in 4.1.3

Was not a valid Verb, although it contained a valid Verb. Brought the Verb out to the root level of the object to parallel the structure of examples given elsewhere in the document.
Fixed example 4.1.6.2#1

Spaces are not allowed in an IRI. Fixed indenting.
fixed indents
changed Interaction Activity properties table and made interactionType required, b/c requirements list says 'Interaction Activities MUST have a valid interactionType.'
undid last commit

interaction activity properties are optional
Merge pull request #474 from chaimleib-scorm/master

Bug fixes in examples
Update xAPI.md

Updated to add "in context", per the spec call on Aug 6, 2014.  Still may need to disambiguate the first requirement from its note.
Merge pull request #1 from adlnet/master

Updated from master