Garden-o-matic: Display the full [TB]R=... list of reviewers

Dot-trimming of the R=... line originated from the
ChangeLog "Reviewed by John Doe." format where it was necessary
to remove the trailing period. As a result, a reviewers line like
"foo@chromium.org, bar" would turn into "foo@chromium".

R=eseidel
NOTRY=true

Review URL: https://codereview.chromium.org/183003003

git-svn-id: svn://svn.chromium.org/blink/trunk@168108 bbb929c8-8fbe-4397-9dbb-9b2b20218538