Disallow blank nodes as data types

This closes #257
Applied all of David Booth and Peter Patel-Schneider's feedback.

Related to #222.
Added more spec reviewers to Acknowledgements section.
Added time-stamped version of JSON-LD Syntax spec.
Fixed language describing how JSON numbers map to XML Schema.
Remove 'arbitrarily precise' distinction.
Adding missing image to 20130630 ED
Fix typo
Remove "unordered lists" from data model
Link all definitions in the Data Model to RDF Concepts

This is an attempt to reach consensus with Peter Patel-Schneider.
Replace "normative summary" with just "summary" in data model
Use jquery 1.8.3 as jquery-ui is not compatible with 1.9.x yet.
Close line break elements.
Update to latest jsonld.js.
Revert and use jquery 1.9.0 to fix tabbing problem temporarily.

- Version 1.9.0 has problems with jquery-ui, however 1.8.3 causes
  the tabs on the UI to break. This needs to be resolved.
Update to latest jsonld.js (use new Promise API).
Remove old Future lib.
Update IDL to use Promise and new RemoteDocument/LoadDocumentCallback.
Update ReSpec to v3.1.60
Update "Data Model" and "Relationship to RDF" according Peter P. Schneider's suggestions

... also clarified with/without fractions in the API spec.