[gh-463] Fix a bug where redirects form some/path to some/path/ were igonred.
[gh-568] Don't display tile placeholders when not set by drupal.
[gh-491] Switch from using RewriteRules to a RewriteMap when creating subsites.
[gh-487] Upgrade Varnish module to 7.x-1.0-beta1
Merge pull request #573 from tsteiner2/issue-487

Closes #487
Merge pull request #569 from tsteiner2/issue-463

Closes #463.
Merge pull request #570 from tsteiner2/issue-568

Closs #568.
Merge pull request #572 from tsteiner2/issue-491

Closes #491.