Merge branch 'pb/ref-filter-with-crlf'

A commit and tag object may have CR at the end of each and every line (you can create such an object with hash-object or using --cleanup=verbatim to decline the default clean-up action), but it would make it impossible to have a blank line to separate the title from the body of the message. Be lenient and accept a line with lone CR on it as a blank line, too. * pb/ref-filter-with-crlf: log, show: add tests for messages containing CRLF ref-filter: handle CRLF at end-of-line more gracefully