Merge branch 'ls/subtree'
"git subtree" updates.
* ls/subtree: (30 commits)
subtree: be stricter about validating flags
subtree: push: allow specifying a local rev other than HEAD
subtree: allow 'split' flags to be passed to 'push'
subtree: allow --squash to be used with --rejoin
subtree: give the docs a once-over
subtree: have $indent actually affect indentation
subtree: don't let debug and progress output clash
subtree: add comments and sanity checks
subtree: remove duplicate check
subtree: parse revs in individual cmd_ functions
subtree: use "^{commit}" instead of "^0"
subtree: don't fuss with PATH
subtree: use "$*" instead of "$@" as appropriate
subtree: use more explicit variable names for cmdline args
subtree: use git-sh-setup's `say`
subtree: use `git merge-base --is-ancestor`
subtree: drop support for git < 1.7
subtree: more consistent error propagation
subtree: don't have loose code outside of a function
subtree: t7900: add porcelain tests for 'pull' and 'push'
...