I am running on OS X  MAMP PRO
php: 5.6.10

This solution works great for DRUPAL 7.
But I have had some trouble as I was experimenting with drupal 8.
I can get DRUPAL 8 to install, and I can get some themes to work, such as..
Zurb Foundation 8.x-5.0-beta1
and boot strap Bootstrap 8.x-3.0-alpha1

but I get this error
The website encountered an unexpected error. Please try again later.


when I use...
Themage 8.x-1.02 (default theme)
Bootstrap Business 8.0.0-rc3 (default theme)
Bootstrap Clean Blog 8.x-1.x-dev (default theme)


My log says...
Twig_Error_Syntax: The filter "passthrough" does not exist in "themes/bootstrap_clean_blog/templates/node.html.twig" at line 22 in Twig_ExpressionParser->getFilterNodeClass() (line 608 of /Users/vincentyoumans/Sites/MAMP/SITES/DRUP8-01/vendor/twig/twig/lib/Twig/ExpressionParser.php).

LogicException: You are not allowed to use css in #attached. in Drupal\Core\Render\HtmlResponseAttachmentsProcessor->processAttachments() (line 150 of /Users/vincentyoumans/Sites/MAMP/SITES/DRUP8-01/core/lib/Drupal/Core/Render/HtmlResponseAttachmentsProcessor.php).