Support uniqueItems with hackEnum

• Hackfmt everything
• Support uniqueItems when items contains a hackEnum constraint

Bugfix last release

Bugfix for 4.102.3: #59

Add hackEnum extension

Adds support for a custom hackEnum extension to the string and number schemas, which allows specifying the path to a Hack enumeration which will be used to validate and ultimately type the input.

Add support to discard additional arguments

• #52 A new discard_additional_properties validator config was added to discard additional properties instead of failing hard.

Support minItems and maxItems properties

v4.102.1

Merge pull request #53 from betsyalegria/alegria-support-minPropertie…

Support HHVM 4.102, use new function reference syntax

No functional changes

Support HHVM 4.80

Updates for is_array and TypeAssert

Don't fail if uniqueItems isn't an arraykey

Merge pull request #45 from ianhoffman/ih-uniqueItems-2

Skip unsupported uniqueItems constraints

Output keyset for uniqueItems

Small release for: #42

Support better defaults

Small release to support better defaults: #41