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>
Merge pull request #52 from gkellogg/master

Fix JSON-LD example where context is broken.
Added multi-file support for examples and schema development, thanks Richard W.
Fixed missing 'name' property in Event example, reported by Pierre Far.
Merge pull request #56 from danbri/master

Fixed missing 'name' property in Event example, reported by Pierre Far.
Add 4 Map subtypes, 'map' property now 'hasMap' and expects Map values.
Updated schema to use an enumeration for maps.
Examples updated to use an enumeration.
Merge branch 'master' into sdo-map
Fixed JSON-LD markup for enumerated value.
Merge branch 'sdo-multifile' into sdo-map
Added new Map example.
Whitespace.
Merge branch 'sdo-multifile'
This adds ability to develop schemas as data/*.rdfa with examples data/*examples.txt
For final contributions, schemas should be integrated. During development, separate
files (especially the examples) make comparison of parallel branches easier. We may
move to separate files per topic for examples in future.
Removed commented out earlier lines.
Removed commented lines.
Merge pull request #57 from danbri/master

Adding multi-file support (data/*.rdfa, data/*example.txt)
Merge branch 'sdo-map'
Made version number of schema into a variable. Bumped it to 1.7.
Add 'organizer' property (from Event to Person or Organization), as agreed.