Fix description of #463
Take CR/LF into account when separating content from YAML metadata

Fixes issue #470
Merge pull request #471 from gpakosz/fix-metadata-crlf-bug

Take CR/LF into account when separating content from YAML metadata
Bump version
Add 3.7.3 release notes
Update Gemfile.lock
Fail checks when output directory is not present

Currently, site checks pass when the output directory is not present.
Ensure that all checks fail in cases where there is no generated site
content to validate.
Incorporate review feedback
Merge pull request #472 from jugglinmike/fail-check-for-empty-output

Fail checks when output directory is not present
Fix wrong #exist? call
Merge branch 'release-3.7.x'