Update version number to 0.9.2 in appledoc settings file for correct documentation generation.
Fix an error in the documentation for kJSONModelMissingKeys.
Add a type-mismatch error to give more detail when the JSON is invalid because of the wrong type.
Merge pull request #87 from j-h-a/update-appledoc-settings

Update version number to 0.9.2 in appledoc settings file for correct documentation generation.
Merge pull request #88 from j-h-a/fix-documentation-error

Fix an error in the documentation for kJSONModelMissingKeys.
Merge pull request #89 from j-h-a/improve-error-checking

Add a type-mismatch error to give more detail when the JSON is invalid because of the wrong type.