Add RDFS for type and attribute pages

Includes properties such as:
* rdfs:comment
* rdfs:label
* rdfs:subClassOf

With this patch, individual type and attribute pages will now express basic
RDFS; classes will express their immediate subclass relationship and all
of the properties that can be applied to them, while attributes express
their domainIncludes values.

Addresses #24

Signed-off-by: Dan Scott <dan@coffeecode.net>
Clarify that RDFa and JSON-LD are supported formats

The getting started documentation referred to a long-term plan to
support a broader variety of formats, but RDFa and JSON-LD are
pretty tightly integrated into the rest of the schema.org documentation,
so we might as well mention them explicitly in the getting started (but
continue documenting with microdata as the default approach).

Signed-off-by: Dan Scott <dan@coffeecode.net>
Consistency of encoding / associatedMedia

Use the same definition for encoding and associatedMedia,
as they are synonyms for one another. Also make the definition
agree grammatically with singular vs plural.

Also refer to "CreativeWork" in the description rather than
"creative work", as the former seems to be the predominant form used
for properties on CreativeWork.

Signed-off-by: Dan Scott <dan@coffeecode.net>
First cut at schema for ItemList / ListItem, based on Martin Hepp's draft.
sdopending while pending.
Adding numberOfElements property, as suggested by Alexander Shubin.
code clean up in license examples
Adding example for ItemList from Alexander Shubin,
http://lists.w3.org/Archives/Public/public-vocabs/2014Jun/0122.html
rel attribute is typically in the a element, not in the image

see http://wiki.creativecommons.org/RDFa
Scrubbed mention of 'asset' property (which never really existed) from distance property. Reworded slightly.
See also http://lists.w3.org/Archives/Public/public-vocabs/2014Jun/0126.html
Added Microdata and RDFa examples for every Role example.
Merge pull request #39 from danbri/master

More changes for 1.6, removed mentions of non-property 'asset', added Microdata/RDFa for Role examples.
Fixes to JSON-LD ItemList example.
An ItemList example was tagged to show in the ListItem page.
Merge branch 'master' into sdo-itemlist

Conflicts:
	app.yaml
Merge pull request #38 from scor/license-example-tweaks

License example tweaks
Keeping scor's changes except that in RDFa, rel="license" works better
(and matches the original page's approach more faithfully).
Merge pull request #40 from danbri/master

Keeping scor's changes except that in RDFa, rel="license" works better
Merge branch 'master' into sdo-itemlist
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