Fix #281: When a value == true or 'true' make it the key only.
Fix #281: When a value == true or 'true' make it the key only.

jeremy/jekyll-assets,jeremy/jekyll-assets,jekyll/jekyll-assets,mattbeedle/jekyll-assets,jekyll/jekyll-assets,mattbeedle/jekyll-assets,jeremy/jekyll-assets,jekyll/jekyll-assets,jekyll/jekyll-assets,mattbeedle/jekyll-assets,jekyll-assets/jekyll-assets,mattbeedle/jekyll-assets,jekyll-assets/jekyll-assets,jeremy/jekyll-assets,jekyll-assets/jekyll-assets