0.12.0

• Tests for message formats (PR #266) (#7451)
• Pin clamp version to < 1.2.0 (#22554)
• Fix "unknown version" message (#7451)
• Remove legacy Gemfile code for Ruby < 2.0 (#22549)
• Allow hiding headers from output of list actions (PR #253) (#20978)
• Review whitespace in extracted strings (#7451)
• Matches user prefix in output messages for CA certs (#21707)
• Make option sources overridable (#21768)
• Allow empty parameters in hammer (PR #260) (#17252)
• Shareable locale Makefile and Rakefile definitions (PR #249) (#20513)
• Support for deprecating commands (#20804)
• Remove legacy config code (#20611)
• Number normalizers for Integer params (#21013)
• More detailed description of ssl options (PR #248) (#12401)
• Consistant capitalization in hammer help (#19511)
• Saving defaults from hammer shell (PR #244) (#19676)