Profiles extra properties

[FeLungs]

Change Log item Ids:

s1, s2, s3

1.0.3 text -> 9274.1.1 Update

Additional properties SHOULD* NOT be added to Statements unless explicitly allowed by this specification.
->
An LRP SHALL not add additional properties to Statements

Additional properties SHOULD* NOT be added to Statements and other objects unless explicitly allowed by this specification and the LRS SHOULD* reject Statements containing such additional properties.
->
An LRP SHALL not add additional properties to Statements

Additional properties SHOULD* NOT be added to Statements and other objects unless explicitly allowed by this specification and the LRS SHOULD* reject Statements containing such additional properties
->
An LRS shall reject a Statement with additional properties other than extensions in the locations where extensions are allowed

Updates to xAPI Profile spec

• language that explicitly states xAPI Profiles should not contain any additional properties
• language that explicitly states an xAPI Profile Server should not add any additional properties to a profile
• language that explicitly states an xAPI Profile Server should reject a profile with any additional properties

[imartinezortiz]

This issue has been migrated to upstream repo adlnet#273