FIX ArchiveDate enforcement
FIX Check for stage and drafts in SiteTree::canView()
Merge pull request #825 from simonwelsh/canview

FIX Check for stage and drafts in SiteTree::canView()
Merge pull request #824 from hafriedlander/fix/archivedate

FIX ArchiveDate enforcement
Merge remote-tracking branch 'origin/3.0' into 3.1.0

Conflicts:
	code/controllers/ContentController.php
	code/model/SiteTree.php
	tests/search/SearchFormTest.php