updated news
added tests for xOneOf
refactored forall tool, but it's still not fully functinoal
kept working on forall tool
added comments, and temporarily commented out code
added handling of exhausted cases in forall
added several examples
removed exists and forall, made no test cases match a warning
fixed bug in levels support
Update README.md
update readme
Merge branch 'develop' of https://github.com/rgrannell1/arrow into develop
fixed an issue with negative error being thrown when no negative properties given, and added tests for xIs
added more tests
added x__
updated news
Merge branch 'develop' into releases