mmistakes/minimal-mistakes — pull request #115 by alexmcpherson (2014-12-31 21:49:44+00:00)
Title: Adding 'vendor' to the exclude list

If you have .bundle/config including `BUNDLE_PATH: vendor/bundle` (a relatively common way to isolate gems) then jekyll will try to build the demo post included in the gem, which has an invalid date of 0000-00-00