Merge branch 'fm/shell-path-whitespace' into maint

Portability fix for Windows, which may rewrite $SHELL variable using non-POSIX paths. * fm/shell-path-whitespace: rebase-i-exec: Allow space in SHELL_PATH

Jeff King committed Dec 1, 2015 at 17:19 UTC 45e330f512b5a32f2e3aae800e57b07fd75f607e

No changes.