Merge branch 'ns/pretty-format'

Merge branch 'ns/pretty-format'

* ns/pretty-format:
  bash completion: add --format= and --oneline options for "git log"
  Add tests for git log --pretty, --format and --oneline.
  Add --oneline that is a synonym to "--pretty=oneline --abbrev-commit"
  Give short-hands to --pretty=tformat:%formatstring
  Add --format that is a synonym to --pretty