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>
Adding in Sports vocabulary (v3.2 of SportsVocabulary doc).
This includes changes to startDate/endDate expected types to allow use on Statistic type.
First cut at schema for ItemList / ListItem, based on Martin Hepp's draft.
This branch is posted to sdo-sports.appspot.com
Adding numberOfElements property, as suggested by Alexander Shubin.
Adding example for ItemList from Alexander Shubin,
http://lists.w3.org/Archives/Public/public-vocabs/2014Jun/0122.html
Fixes to JSON-LD ItemList example.
Adding 3.2 examples set for Sports, via Jason Johnson.
An ItemList example was tagged to show in the ListItem page.
Merge branch 'master' into sdo-itemlist

Conflicts:
	app.yaml
Merge branch 'master' into sdo-sports

Conflicts:
	app.yaml
	data/examples.txt
Merge branch 'master' into sdo-sports
Merge branch 'master' into sdo-itemlist
Merge branch 'master' into sdo-itemlist
Merge branch 'master' into sdo-sports
Merge branch 'master' into sdo-itemlist
Merge branch 'master' into sdo-sports
sdo-itemlist.appspot.com
Merge branch 'master' into sdo-itemlist
Merge branch 'master' into sdo-sports