Merge pull request #188 from stojg/pull/should-not-be-able-to-delete-active-workflow

SECURITY: Enforce the DELETE_WORKFLOW permission for active workflows.
DOCS: Expand the docs on what the AWF permissions are for
Merge pull request #190 from stojg/pull/docs-expand-on-awf-permissions

DOCS: Expand the docs on what the AWF permissions are for
BUG Ensure that past dates for embargo / expiry are handled elegantly
Tests also consider publish > unpublish and unpublish > publish workflows
Merge pull request #191 from tractorcow/pulls/fix-embargo

BUG Ensure that past dates for embargo / expiry are handled elegantly
Merge branch 'master' of git://github.com/silverstripe-australia/advancedworkflow into pulls/i18n-js-fix

Conflicts:
	code/extensions/WorkflowEmbargoExpiryExtension.php