clarified "conflict with verb display"

resolve issue: https://github.com/adlnet/xAPI-Spec/issues/180
updated version # to 1.0.0
updated example signature based on new ver # in example statement
reference Semantic Versioning

Small change to actual requirements, mainly the declaration that we will conform
to Semantic versioning impacts future releases.
specify consistent-through format
activity definition / metadata clarification
Appendix C: fixed JSON
Appendix C: matching, trivial cleanup
Appendix C: matching, removed the 'object' curly bracket like for the other definitions
Yet another bunch of minor cleanups
Removed 'statements/' i.e. rolling back as per PR comments
Rephrased as per PR comments
Merge pull request #182 from bscSCORM/verbdisplay

clarified "conflict with verb display"
Fixed as per PR comments
Merge pull request #185 from bscSCORM/compat

Semantic versioning
Changes based on feedback

* Noted activity definition is optional (for clarity, noted that activity id is required)
* Noted activity definition properties other than name, description, and type only MAY be included (as opposed to SHOULD)
* Moved a line for flow
Optinal -> Optional
another attempt at allowing fileUrl only attachments to skip mime-multipart format
Removed the traling / as per PR comments
Merge pull request #190 from scara/v10_Yet_another_minor_cleanup

Yet another bunch of minor cleanups