* sg/bash-prompt:
bash prompt: mention that PROMPT_COMMAND mode is faster
bash prompt: avoid command substitution when finalizing gitstring
bash prompt: avoid command substitution when checking for untracked files
bash prompt: use bash builtins to check stash state
bash prompt: use bash builtins to check for unborn branch for dirty state
bash prompt: combine 'git rev-parse' for detached head
bash prompt: combine 'git rev-parse' executions in the main code path
bash prompt: use bash builtins to find out current branch
bash prompt: use bash builtins to find out rebase state
bash prompt: run 'git rev-parse --git-dir' directly instead of __gitdir()
bash prompt: return early from __git_ps1() when not in a git repository
bash prompt: print unique detached HEAD abbreviated object name
bash prompt: add a test for symbolic link symbolic refs
completion, bash prompt: move __gitdir() tests to completion test suite
bash prompt: use 'write_script' helper in interactive rebase test
bash prompt: fix redirection coding style in tests