Fixed flaws in schema with regard to v4 (Draft)
Added "additionalItems" property to missing arrays
Renamed "awardDate" to "award"

Renaming necessary for tests to pass. Property name `awardDate` was in the `schema.json` but all the examples (`resume.json`, `thomasdavis.json` and `rolandsharp.json`) actually had `date` only.
Merge pull request #107 from mwaclawek/schema-flaws-madskristensen

Schema corrections by @madskristensen without tabs/spaces
Update README.md