Merge branch 'master' of https://github.com/everit-org/json-schema

changing version number to 1.6.0 from 1.6.0-SNAPSHOT

bumping version number to 1.5.1

Revert "Revert "exposing NotSchema#mustNotMatch property, as requeste…

…d in everit-org#53""

This reverts commit 3e1a7a6.

bumping version number to 1.4.1

upgrading to org.json:json:20160810

handling root "id" as default resolution scope in constructor instead…

… of in preceding load()

bumping version number to 1.3.0-RC1

adding yet another test to datetime parsing

bumping version number to 1.1.1