Abort when auto-correct causes an infinite loop.
Added periods where periods are due.
Merge pull request #1492 from dblock/conflicting-cops

Abort when auto-correct causes an infinite loop.
Merge pull request #1499 from dblock/readme-dots

Added periods where periods are due.
Require digest/md5 for ProcessedSource#checksum
Merge pull request #1502 from jonas054/require_digest_md5

Require digest/md5 for ProcessedSource#checksum