Update docs for Prismic\Ref::__construct
Add private setter for the scheduled timestamp that converts the property to unix timestamp if not null
ignore local phpunit.xml
Add test case for Prismic\Ref
Add method `getScheduledDate()` to return a `DateTime` instance if the ref is scheduled
Keep JS timestamp in $this->maybeScheduledAt and add an accessor for Unix timestamp. Update tests to suit
Merge branch 'master' into sheduled-ref-timestamps

Conflicts:
	.gitignore
Merge pull request #71 from gsteel/sheduled-ref-timestamps

Scheduled ref timestamps