v1.2.0
Merge branch 'release/1.2.0' into production
Merge tag 'v1.2.0'

1.2.0

 * Annotate release tags with changelog (Ryan Graham)

 * Remove unused second argument to shift (Sam Roberts)

 * Fix incorrect use of backticks (Miroslav Bajtoš)

 * slt-release-finish: use the same tag in all places (Miroslav Bajtoš)

 * slt-release,finish,start: gitflow release tools (Sam Roberts)

 * Add usage to 'slt version' (Ryan Graham)

 * slt-changelog: --version & --sumary work together (Ryan Graham)